|
| 1946 |
0.60 |
| 1947 |
0.90 |
| 1948 |
0.50 |
| 1949 |
0.30 |
| 1950 |
0.90 |
| 1951 |
1.10 |
| 1952 |
1.70 |
| 1953 |
2.30 |
| 1954 |
1.50 |
| 1955 |
2.50 |
| 1956 |
1.80 |
| 1957 |
1.70 |
| 1958 |
1.50 |
| 1959 |
1.70 |
| 1960 |
1.90 |
| 1961 |
2.30 |
| 1962 |
3.00 |
| 1963 |
2.50 |
| 1964 |
3.00 |
| 1965 |
3.10 |
| 1966 |
3.00 |
| 1967 |
2.90 |
| 1968 |
3.50 |
| 1969 |
3.50 |
| 1970 |
3.40 |
| 1971 |
3.90 |
| 1972 |
3.80 |
| 1973 |
4.70 |
| 1974 |
4.60 |
| 1975 |
4.50 |
| 1976 |
6.70 |
| 1977 |
6.20 |
| 1978 |
5.40 |
| 1979 |
6.30 |
| 1980 |
7.00 |
| 1981 |
7.20 |
| 1982 |
6.90 |
| 1983 |
9.00 |
| 1984 |
8.60 |
| 1985 |
6.90 |
| 1986 |
8.00 |
| 1987 |
12.70 |
| 1988 |
12.70 |
| 1989 |
10.40 |
| 1990 |
12.60 |
| 1991 |
15.70 |
| 1992 |
21.50 |
| 1993 |
27.50 |
| 1994 |
34.10 |
| 1995 |
55.60 |
| 1996 |
40.10 |
| 1997 |
41.30 |
| 1998 |
69.50 |
| 1999 |
68.50 |
| 2000 |
69.40 |
| 2001 |
65.10 |
| 2002 |
71.10 |
| 2003 |
109.10 |
| 2004 |
90.30 |
| 2005 |
68.10 |
| 2006 |
107.30 |
| 2007 |
150.50 |
| 2008 |
114.90 |
| 2009 |
114.70 |
| 2010 |
147.00 |
| 2011 |
140.30 |
| 2012 |
124.90 |
| 2013 |
173.40 |
| 2014 |
149.00 |
| 2015 |
160.00 |
| 2016 |
163.00 |
| 2017 |
161.00 |
| 2018 |
194.00 |
|