| Year | Productiona | Importsb | Exportsb | Losses | Closing stock | Domestic use | Domestic consumption | |
|---|---|---|---|---|---|---|---|---|
| total | per capita | |||||||
| tousand tonnes | kg | |||||||
| 1970 | 23.0 | 2.4 | 16.5 | 0.2 | 0.3 | 8.5 | 8.5 | 0.8 |
| 1975 | 21.3 | – | 15.6 | 0.1 | 0.0 | 5.6 | 5.6 | 0.5 |
| 1980 | 22.5 | – | 17.5 | 0.2 | 0.0 | 5.3 | 5.3 | 0.5 |
| 1981 | 24.6 | 0.5 | 19.1 | 0.2 | 0.3 | 5.5 | 5.5 | 0.5 |
| 1982 | 24.5 | 0.1 | 21.0 | 0.0 | 0.0 | 3.9 | 3.9 | 0.4 |
| 1983 | 24.8 | – | 21.1 | 0.0 | 0.0 | 3.7 | 3.7 | 0.3 |
| 1984 | 27.2 | – | 23.2 | 0.0 | 0.0 | 4.0 | 4.0 | 0.4 |
| 1985 | 25.5 | – | 21.7 | 0.0 | 0.0 | 3.8 | 3.8 | 0.4 |
| 1986 | 22.2 | – | 18.5 | 0.0 | 0.0 | 3.7 | 3.7 | 0.4 |
| 1987 | 21.3 | 0.1 | 18.2 | 0.0 | 0.0 | 3.2 | 3.2 | 0.3 |
| 1988 | 23.7 | 1.0 | 20.9 | 0.0 | 0.0 | 3.8 | 3.8 | 0.4 |
| 1989 | 22.4 | 0.3 | 17.4 | 0.0 | 0.0 | 5.3 | 5.3 | 0.5 |
| 1990 | 19.4 | 0.7 | 15.4 | 0.0 | 0.0 | 4.7 | 4.7 | 0.4 |
| 1991 | 13.7 | .. | .. | 0.1 | 0.0 | 5.4 | 5.4 | 0.5 |
| 1992 | 14.9 | 0.4 | 8.3 | 0.1 | 0.0 | 6.9 | 6.9 | 0.7 |
| 1993 | 14.9 | 0.2 | 8.8 | 0.1 | 0.0 | 6.2 | 6.2 | 0.6 |
| 1994 | 12.0 | 0.6 | 6.7 | 0.0 | 0.0 | 5.9 | 5.9 | 0.6 |
| 1995 | 10.7 | 0.5 | 6.4 | 0.0 | 0.0 | 4.8 | 4.8 | 0.5 |
| 1996 | 10.7 | 2.3 | 8.4 | 0.0 | 0.0 | 4.6 | 4.6 | 0.5 |
| 1997 | 9.6 | 2.8 | 7.0 | 0.0 | 0.0 | 5.3 | 5.3 | 0.6 |
| 1998 | 8.6 | 1.7 | 5.3 | 0.0 | 0.0 | 5.0 | 5.0 | 0.5 |
| 1999 | 8.5 | 2.0 | 6.4 | 0.0 | 0.0 | 4.2 | 4.2 | 0.4 |
| 2000 | 8.6 | 2.9 | 7.0 | 0.0 | 0.0 | 4.5 | 4.5 | 0.4 |
| 2001 | 10.7 | 3.5 | 10.4 | 0.0 | 0.0 | 3.8 | 3.8 | 0.4 |
| 2002 | 9.9 | 2.9 | 9.7 | 0.0 | 0.0 | 3.1 | 3.1 | 0.3 |
| 2003 | 9.5 | 2.1 | 8.9 | 0.0 | 0.0 | 2.7 | 2.7 | 0.3 |
| 2004 | 10.0 | 1.9 | 9.7 | 0.0 | 0.0 | 2.2 | 2.2 | 0.2 |
| 2004 | 1.2 | 0.7 | 0.5 | 0.0 | 0.0 | 1.4 | 1.4 | 0.1 |
| 2005 | 0.9 | 0.7 | 0.2 | 0.0 | 0.0 | 1.4 | 1.4 | 0.1 |
| 2006 | 0.9 | 0.7 | 0.1 | 0.0 | 0.0 | 1.5 | 1.5 | 0.1 |
| 2007 | 0.9 | 0.8 | 0.2 | 0.0 | 0.0 | 1.5 | 1.5 | 0.1 |
| 2008 | 0.9 | 1.1 | 0.6 | 0.0 | 0.0 | 1.4 | 1.4 | 0.1 |
| 2009 | 0.9 | 0.9 | 0.4 | 0.0 | 0.0 | 1.4 | 1.4 | 0.1 |
| 2010 | 0.9 | 1.1 | 0.8 | 0.0 | 0.0 | 1.2 | 1.2 | 0.1 |
| 2011 | 1.1 | 1.3 | 0.9 | 0.0 | 0.0 | 1.5 | 1.5 | 0.2 |
| 2012 | 1.2 | 1.5 | 1.2 | 0.0 | 0.0 | 1.5 | 1.5 | 0.2 |
| 2013 | 1.0 | 0.8 | 0.5 | 0.0 | 0.0 | 1.3 | 1.3 | 0.1 |
| 2014 | 1.3 | 0.5 | 0.2 | 0.0 | 0.0 | 1.6 | 1.6 | 0.2 |
| 2015 | 1.4 | 0.6 | 0.2 | 0.0 | 0.0 | 1.8 | 1.8 | 0.2 |
| 2016 | 1.2 | 0.6 | 0.5 | 0.0 | 0.0 | 1.3 | 1.3 | 0.1 |
| 2017 | 1.8 | 0.6 | 0.4 | 0.0 | 0.0 | 2.0 | 2.0 | 0.2 |
| 2018 | 1.7 | 0.5 | 0.5 | 0.0 | 0.0 | 1.7 | 1.7 | 0.2 |
| 2019 | 1.6 | 0.5 | 0.5 | 0.0 | 0.0 | 1.6 | 1.6 | 0.2 |