| Year | 
        Production | 
        Imports | 
        Exports | 
        Losses | 
        Closing stock | 
        Domestic use | 
        Domestic consumption | 
    
    
        | total | 
        per capita | 
    
    
        | thousand tonnes | 
        kg | 
    
    
        | 1970 | 
        312.0 | 
        28.8 | 
        29.3 | 
        6.2 | 
        74.7 | 
        307.4 | 
        307.4 | 
        29.8 | 
    
    
        | 1975 | 
        501.4 | 
        2.1 | 
        63.3 | 
        15.0 | 
        63.5 | 
        436.4 | 
        436.4 | 
        41.4 | 
    
    
        | 1980 | 
        564.3 | 
        4.0 | 
        127.1 | 
        12.5 | 
        62.9 | 
        430.9 | 
        430.9 | 
        40.2 | 
    
    
        | 1981 | 
        567.5 | 
        6.9 | 
        126.0 | 
        13.8 | 
        60.9 | 
        436.6 | 
        436.6 | 
        40.8 | 
    
    
        | 1982 | 
        603.5 | 
        1.8 | 
        155.3 | 
        14.6 | 
        59.5 | 
        436.8 | 
        436.8 | 
        40.9 | 
    
    
        | 1983 | 
        653.8 | 
        2.2 | 
        171.5 | 
        16.6 | 
        66.1 | 
        461.3 | 
        461.3 | 
        43.3 | 
    
    
        | 1984 | 
        691.4 | 
        0.5 | 
        214.5 | 
        18.6 | 
        67.8 | 
        457.1 | 
        457.1 | 
        43.0 | 
    
    
        | 1985 | 
        627.6 | 
        0.8 | 
        167.0 | 
        17.2 | 
        56.0 | 
        456.0 | 
        456.0 | 
        43.1 | 
    
    
        | 1986 | 
        606.8 | 
        6.0 | 
        152.9 | 
        15.3 | 
        51.7 | 
        448.9 | 
        448.9 | 
        42.6 | 
    
    
        | 1987 | 
        638.6 | 
        0.4 | 
        165.1 | 
        16.8 | 
        51.0 | 
        457.8 | 
        457.8 | 
        43.7 | 
    
    
        | 1988 | 
        634.3 | 
        0.6 | 
        175.6 | 
        15.6 | 
        54.8 | 
        439.9 | 
        439.9 | 
        42.1 | 
    
    
        | 1989 | 
        633.2 | 
        0.7 | 
        178.8 | 
        14.6 | 
        44.6 | 
        450.7 | 
        450.7 | 
        43.3 | 
    
    
        | 1990 | 
        615.9 | 
        2.6 | 
        197.4 | 
        12.1 | 
        52.1 | 
        401.5 | 
        401.5 | 
        38.8 | 
    
    
        | 1991 | 
        562.1 | 
        .. | 
        .. | 
        10.5 | 
        41.0 | 
        389.4 | 
        389.4 | 
        37.6 | 
    
    
        | 1992 | 
        445.2 | 
        7.4 | 
        76.0 | 
        5.7 | 
        39.7 | 
        372.2 | 
        372.2 | 
        36.0 | 
    
    
        | 1993 | 
        391.4 | 
        8.5 | 
        69.5 | 
        4.4 | 
        37.6 | 
        328.1 | 
        328.1 | 
        31.7 | 
    
    
        | 1994 | 
        352.4 | 
        12.6 | 
        63.3 | 
        3.3 | 
        32.1 | 
        303.9 | 
        303.9 | 
        29.4 | 
    
    
        | 1995 | 
        332.9 | 
        19.1 | 
        72.7 | 
        4.1 | 
        27.2 | 
        280.1 | 
        280.1 | 
        27.1 | 
    
    
        | 1996 | 
        413.9 | 
        12.2 | 
        134.6 | 
        7.0 | 
        33.8 | 
        277.9 | 
        277.9 | 
        27.0 | 
    
    
        | 1997 | 
        358.3 | 
        20.4 | 
        103.1 | 
        8.9 | 
        31.0 | 
        269.5 | 
        269.5 | 
        26.2 | 
    
    
        | 1998 | 
        353.2 | 
        34.0 | 
        105.5 | 
        5.2 | 
        34.7 | 
        272.7 | 
        272.7 | 
        26.6 | 
    
    
        | 1999 | 
        393.7 | 
        13.4 | 
        105.7 | 
        11.3 | 
        35.2 | 
        289.5 | 
        289.5 | 
        28.3 | 
    
    
        | 2000 | 
        397.3 | 
        27.2 | 
        131.2 | 
        8.9 | 
        33.9 | 
        285.7 | 
        285.7 | 
        28.0 | 
    
    
        | 2001 | 
        345.8 | 
        30.5 | 
        114.6 | 
        7.1 | 
        31.4 | 
        257.1 | 
        257.1 | 
        25.2 | 
    
    
        | 2002 | 
        373.3 | 
        39.3 | 
        108.9 | 
        9.7 | 
        37.4 | 
        288.0 | 
        288.0 | 
        28.4 | 
    
    
        | 2003 | 
        363.2 | 
        30.2 | 
        117.9 | 
        5.5 | 
        28.8 | 
        278.6 | 
        278.6 | 
        27.5 | 
    
    
        | 2004 | 
        334.2 | 
        80.5 | 
        110.5 | 
        8.4 | 
        33.1 | 
        291.5 | 
        291.5 | 
        28.8 | 
    
    
        | 2004 | 
        308.7 | 
        66.4 | 
        104.0 | 
        7.7 | 
         | 
        262.1 | 
        262.1 | 
        25.9 | 
    
    
        | 2005 | 
        289.9 | 
        88.5 | 
        102.5 | 
        7.8 | 
        17.5 | 
        269.8 | 
        269.8 | 
        26.7 | 
    
    
        | 2006 | 
        314.5 | 
        83.2 | 
        105.8 | 
        10.9 | 
        17.2 | 
        281.3 | 
        281.3 | 
        27.9 | 
    
    
        | 2007 | 
        322.5 | 
        81.8 | 
        114.1 | 
        11.1 | 
        19.0 | 
        277.3 | 
        277.3 | 
        27.6 | 
    
    
        | 2008 | 
        299.9 | 
        85.2 | 
        115.3 | 
        10.7 | 
        18.8 | 
        259.3 | 
        259.3 | 
        25.8 | 
    
    
        | 2009 | 
        298.1 | 
        104.0 | 
        119.5 | 
        11.0 | 
        19.5 | 
        270.9 | 
        270.9 | 
        27.0 | 
    
    
        | 2010 | 
        300.6 | 
        136.0 | 
        174.3 | 
        11.1 | 
        17.3 | 
        253.4 | 
        253.4 | 
        25.3 | 
    
    
        | 2011 | 
        288.4 | 
        139.0 | 
        171.2 | 
        10.6 | 
        15.8 | 
        247.1 | 
        247.1 | 
        24.8 | 
    
    
        | 2012 | 
        261.2 | 
        145.2 | 
        154.7 | 
        10.1 | 
        14.5 | 
        242.9 | 
        242.9 | 
        24.5 | 
    
    
        | 2013 | 
        245.9 | 
        154.6 | 
        154.4 | 
        9.5 | 
        13.6 | 
        237.5 | 
        237.5 | 
        24.0 | 
    
    
        | 2014 | 
        274.2 | 
        149.0 | 
        159.9 | 
        10.6 | 
        17.1 | 
        249.2 | 
        249.2 | 
        25.3 | 
    
    
        | 2015 | 
        302.7 | 
        143.9 | 
        164.2 | 
        11.7 | 
        16.8 | 
        271.0 | 
        271.0 | 
        27.5 | 
    
    
        | 2016 | 
        306.5 | 
        154.4 | 
        159.6 | 
        11.9 | 
        18.5 | 
        287.7 | 
        287.7 | 
        29.3 | 
    
    
        | 2017 | 
        314.1 | 
        163.4 | 
        166.4 | 
        12.2 | 
        19.6 | 
        297.8 | 
        297.8 | 
        30.4 | 
    
    
        | 2018 | 
        313.0 | 
        177.3 | 
        156.0 | 
        12.4 | 
        19.8 | 
        321.7 | 
        321.7 | 
        32.9 | 
    
    
        | 2019 | 
        311.7 | 
        197.0 | 
        173.3 | 
        12.3 | 
        19.3 | 
        323.6 | 
        323.6 | 
        33.1 | 
    
    
        | 2020 | 
        307.6 | 
        159.7 | 
        171.7 | 
        12.1 | 
        18.8 | 
        284.0 | 
        284.0 | 
        29.1 | 
    
    
        | 2021 | 
        319.3 | 
        170.5 | 
        183.8 | 
        12.5 | 
        19.2 | 
        293.1 | 
        293.1 | 
        30.2 | 
    
    
        | 2022 | 
        297.5 | 
        188.5 | 
        184.7 | 
        11.6 | 
        18.1 | 
        290.8 | 
        290.8 | 
        30.1 | 
    
    
        | 2023 | 
        288.4 | 
        170.4 | 
        167.4 | 
        11.2 | 
        17.3 | 
        281.0 | 
        281.0 | 
        29.3 | 
    
		
		
		
	 
	.