|
| 1960 |
110.7 |
| 1965 |
94.3 |
| 1970 |
106.4 |
| 1971 |
108.0 |
| 1972 |
112.9 |
| 1973 |
109.1 |
| 1974 |
115.1 |
| 1975 |
122.9 |
| 1976 |
132.2 |
| 1977 |
139.4 |
| 1978 |
148.8 |
| 1979 |
155.7 |
| 1980 |
161.3 |
| 1981 |
166.5 |
| 1982 |
169.7 |
| 1983 |
176.2 |
| 1984 |
179.6 |
| 1985 |
177.9 |
| 1986 |
180.2 |
| 1987 |
193.3 |
| 1988 |
189.9 |
| 1989 |
184.1 |
| 1990 |
164.7 |
| 1991 |
162.5 |
| 1992 |
154.5 |
| 1993 |
140.1 |
| 1994 |
135.9 |
| 1995 |
129.4 |
| 1996 |
132.4 |
| 1997 |
151.8 |
| 1998 |
145.2 |
| 1999 |
147.3 |
| 2000 |
156.0 |
| 2001 |
140.0 |
| 2002 |
138.9 |
| 2003 |
134.3 |
| 2004 |
150.8 |
| 2005 |
162.1 |
| 2006 |
158.5 |
| 2007 |
158.9 |
| 2008 |
153.8 |
| 2009 |
151.5 |
| 2010 |
152.4 |
| 2011 |
148.0 |
| 2012 |
151.8 |
| 2013 |
147.5 |
| 2014 |
152.2 |
| 2015 |
161.0 |
| 2016 |
164.2 |
| 2017 |
160.8 |
| 2018 |
161.5 |
|
