1950 -4.8 -3.1 -0.4 6.8 12.5 16.4 22.8 24.0 17.1 8.3 3.7 -2.9 8.4 
1951 -6.3 -5.0 -1.2 5.8 12.2 15.9 19.7 24.0 15.6 9.7 4.0 -0.5 7.8 
1952 -4.8 -6.9 -1.4 6.1 11.4 16.4 20.4 21.3 16.4 10.5 1.5 -6.0 7.1 
1953 -6.6 -6.2 0.0 5.5 11.3 15.5 20.1 20.2 16.7 10.2 0.3 -1.8 7.1 
1954 -5.5 -3.1 -1.3 6.8 10.6 13.8 17.7 20.6 18.0 9.4 3.7 -0.8 7.5 
1955 -5.8 -3.7 -0.8 6.0 10.2 16.3 23.7 22.3 16.2 10.8 3.8 -0.1 8.2 
1956 -5.2 -4.6 0.0 6.4 14.0 14.9 18.2 19.1 17.7 11.9 3.5 -3.8 7.7 
1957 -4.2 -5.1 -1.8 6.6 12.2 14.0 19.7 21.6 15.8 10.8 5.3 -0.1 7.9 
1958 -3.9 -2.3 -0.5 5.9 11.4 16.0 20.1 20.7 17.0 10.4 4.2 -0.1 8.2 
1959 -5.4 -1.9 1.6 8.4 12.9 15.7 20.1 21.3 17.2 11.3 3.4 -2.4 8.5 
1960 -6.2 -3.2 -0.4 5.2 11.0 15.3 20.0 23.0 18.0 10.2 4.6 -3.0 7.9 
1961 -6.2 -4.0 0.0 7.4 12.5 17.5 21.6 21.7 19.3 10.9 4.2 -1.2 8.6 
1962 -3.6 -3.9 -0.9 8.4 12.7 16.1 20.1 20.6 17.7 9.7 3.6 -0.9 8.3 
1963 -4.7 -2.9 1.1 6.6 12.9 15.6 20.3 21.5 16.0 10.6 5.4 0.1 8.5 
1964 -3.8 -6.1 0.2 6.2 12.7 15.8 18.7 21.5 15.7 9.4 3.9 -1.7 7.7 
1965 -2.8 -4.3 -1.2 4.6 11.8 16.1 18.6 22.1 17.2 10.5 3.7 -2.0 7.9 
1966 -4.7 -3.9 0.8 5.4 12.2 15.7 18.5 22.0 15.8 12.3 4.9 -4.2 7.9 
1967 -6.3 -4.4 0.6 6.5 13.6 15.7 20.9 22.1 16.3 10.4 2.7 -2.1 8.0 
1968 -3.4 -4.8 1.8 7.1 11.6 16.7 20.6 20.8 17.1 8.7 6.2 0.6 8.6 
1969 -5.5 -5.3 -1.4 6.0 11.0 15.0 20.6 19.6 16.4 9.8 3.8 -3.6 7.2 
1970 -5.9 -3.0 -3.0 5.9 13.8 16.0 21.4 21.5 17.4 11.2 4.9 -2.2 8.2 
1971 -5.0 -3.7 0.0 6.4 10.4 14.4 19.0 20.3 15.6 10.5 4.4 -1.4 7.6 
1972 -3.9 -3.8 0.2 6.9 11.8 15.7 20.6 21.7 16.8 11.9 3.7 0.0 8.5 
1973 -2.7 -2.3 -1.9 6.8 12.1 15.8 20.6 23.0 16.8 10.3 3.7 -1.9 8.4 
1974 -3.3 -3.2 -0.9 6.4 12.0 16.1 19.9 21.3 17.3 10.5 3.1 -4.0 7.9 
1975 -4.2 -4.4 -0.3 7.6 11.9 16.5 19.9 22.3 18.6 10.4 4.8 -3.1 8.3 
1976 -4.1 -2.8 0.0 5.9 12.7 15.4 20.4 19.4 16.2 10.5 2.8 -2.0 7.9 
1977 -7.5 -5.5 -0.1 5.2 11.2 15.9 21.3 20.3 17.4 11.3 5.2 -0.6 7.8 
1978 -5.2 -7.6 -0.7 5.4 12.0 17.8 23.2 23.2 17.0 9.7 4.5 -1.0 8.2 
1979 -5.3 -2.6 -0.6 4.6 10.9 17.5 19.4 22.1 16.9 12.5 4.7 0.9 8.4 
1980 -3.9 -5.7 -0.5 4.1 12.3 17.6 19.4 19.0 16.9 10.8 5.1 -0.3 7.9 
1981 -4.9 -3.2 -0.5 6.6 10.3 14.9 21.0 20.9 16.2 11.0 1.8 -0.2 7.8 
1982 -4.4 -4.6 0.7 6.1 13.0 15.8 20.4 22.8 17.8 12.5 5.9 0.3 8.9 
1983 -2.9 -4.5 0.1 9.5 12.4 13.6 18.2 22.3 17.7 9.7 5.1 -1.8 8.3 
1984 -4.7 -5.6 -2.2 5.0 11.4 18.2 22.1 23.6 17.7 10.3 3.7 -2.1 8.1 
1985 -6.9 -2.2 -0.1 7.6 12.4 15.5 20.3 24.6 17.1 10.9 4.1 -3.5 8.3 
1986 -5.8 -5.5 -0.4 6.9 11.4 16.1 18.2 22.3 18.1 8.9 3.5 -1.5 7.7 
1987 -4.9 -3.8 -0.1 6.0 12.0 17.3 20.6 20.6 17.8 11.9 3.6 -2.3 8.2 
1988 -3.8 -5.2 -0.1 7.1 11.4 16.6 18.3 22.9 17.6 10.9 2.9 -0.4 8.2 
1989 -1.9 -1.4 2.4 7.3 11.4 15.2 21.0 23.0 18.4 11.8 6.6 -0.6 9.4 
1990 -4.9 -0.7 2.9 7.9 13.4 17.7 20.8 23.1 18.7 13.0 7.5 1.9 10.1 
1991 -1.2 -2.8 0.3 8.0 13.8 18.8 20.2 21.5 18.4 12.7 4.7 -0.9 9.5 
1992 -2.4 -2.5 1.0 6.9 11.7 16.4 20.7 21.1 16.2 11.6 4.8 0.1 8.8 
1993 -1.7 -2.1 1.3 6.2 11.9 15.4 19.1 20.0 17.5 11.5 5.8 -0.1 8.7 
1994 -4.7 -1.3 -0.5 7.0 13.5 16.9 22.2 24.8 19.8 12.4 5.4 -1.4 9.5 
1995 -3.3 -2.3 0.9 7.3 13.3 15.6 21.5 21.3 17.4 13.1 5.5 0.0 9.2 
1996 -3.7 -3.4 0.5 5.8 10.5 15.7 20.4 20.9 18.2 11.5 4.1 -0.7 8.3 
1997 -2.5 -1.8 0.2 7.2 11.9 15.8 22.0 20.5 17.1 10.8 7.1 0.4 9.1 
1998 -5.9 -3.6 1.6 9.0 13.5 15.5 20.3 21.1 19.2 13.2 3.2 -1.7 8.8 
1999 -3.2 -3.6 -0.5 6.9 11.9 17.8 22.1 24.9 19.7 11.9 5.5 -1.1 9.4 
2000 -3.1 -3.8 0.2 6.1 14.0 16.7 22.2 23.9 18.6 11.6 3.9 -2.5 9.0 
2001 -5.7 -5.5 0.2 8.3 13.4 16.7 20.7 21.1 17.1 12.1 5.0 -3.4 8.3 
2002 -2.5 -0.6 2.5 9.6 13.6 15.9 20.5 20.1 17.7 12.0 2.8 -3.0 9.1 
2003 -3.6 -3.5 0.7 8.2 12.9 17.1 17.7 20.7 17.5 11.6 6.2 0.0 8.8 
2004 -2.5 -1.3 0.7 6.6 13.8 18.5 21.3 21.9 18.4 12.5 7.2 -0.8 9.7 
2005 -3.5 -3.9 0.1 6.2 10.7 18.3 20.1 23.5 18.8 13.2 5.5 -2.6 8.9 
2006 -4.1 -2.7 1.3 5.2 12.9 15.7 20.6 24.3 18.5 11.7 6.2 -0.5 9.1 
2007 -1.8 -1.5 0.9 6.3 12.5 18.8 19.6 23.5 19.1 11.7 3.9 -0.6 9.4