1950 6.0 5.0 7.6 14.5 19.5 22.0 26.6 27.3 23.2 16.6 12.0 6.0 15.5 
1951 4.1 5.5 7.9 13.2 18.4 21.3 25.3 28.5 21.3 18.6 11.7 8.1 15.3 
1952 5.0 4.1 7.6 13.7 18.3 22.1 25.8 28.1 23.7 16.8 13.3 7.0 15.5 
1953 4.4 4.7 9.4 12.4 18.4 22.4 26.2 27.7 23.7 18.2 11.1 8.3 15.6 
1954 6.0 6.2 8.2 15.0 18.4 20.6 24.5 28.1 24.5 16.4 12.8 7.7 15.7 
1955 4.1 6.2 9.4 14.4 18.7 23.7 27.9 27.7 24.0 17.7 10.8 7.9 16.0 
1956 4.7 4.3 8.7 13.6 17.7 23.0 26.8 26.7 23.9 18.2 11.3 5.6 15.4 
1957 5.2 4.5 6.1 14.7 17.4 21.7 25.7 27.8 21.4 17.4 13.0 8.2 15.3 
1958 5.1 6.1 8.5 14.5 18.5 23.0 27.2 27.5 24.1 17.1 12.0 8.4 16.0 
1959 4.4 8.2 9.7 14.9 19.2 22.8 27.6 28.1 25.4 18.5 13.2 8.3 16.7 
1960 5.1 6.8 9.7 13.4 18.7 22.4 27.5 28.3 24.6 17.9 13.3 7.1 16.2 
1961 4.0 4.6 8.9 15.0 19.7 22.7 28.1 28.5 26.3 20.0 13.4 8.0 16.6 
1962 4.5 6.0 8.3 13.7 18.6 21.6 26.8 28.4 24.7 17.7 12.0 7.6 15.8 
1963 2.5 3.3 7.7 14.6 19.5 24.0 27.9 27.7 22.4 17.2 12.3 8.1 15.6 
1964 6.4 4.0 7.8 18.0 20.0 22.6 28.2 29.6 25.0 18.0 11.6 7.5 16.6 
1965 4.6 5.0 6.4 11.7 18.9 22.7 26.8 28.3 22.5 17.1 13.0 7.3 15.4 
1966 4.7 6.7 9.7 14.2 18.2 22.0 26.6 28.7 24.3 18.4 11.9 6.1 16.0 
1967 4.2 5.1 8.9 14.8 20.7 24.0 27.2 29.2 24.6 17.6 13.1 5.7 16.3 
1968 4.5 3.2 8.9 15.0 18.7 23.1 26.1 26.8 22.5 16.5 12.9 10.0 16.3 
1969 5.7 5.6 7.7 14.4 19.5 21.8 26.4 28.1 24.9 17.5 11.8 6.9 15.9 
1970 4.8 6.1 6.1 13.8 19.4 21.2 27.0 28.2 25.3 18.4 12.4 7.7 15.9 
1971 5.5 5.6 7.3 13.7 18.2 22.3 26.9 27.4 23.3 16.6 12.7 8.2 15.6 
1972 7.4 5.7 8.9 13.8 18.1 21.6 26.1 27.0 22.7 17.8 11.8 7.9 15.7 
1973 6.4 7.1 8.2 16.3 18.8 22.2 28.3 28.8 23.3 17.9 11.6 5.6 16.2 
1974 4.3 5.0 8.0 15.3 20.0 23.5 25.8 28.1 23.1 18.2 11.7 7.6 15.9 
1975 4.8 4.6 8.4 14.8 19.3 23.4 27.6 27.7 25.9 18.5 13.4 7.7 16.3 
1976 5.2 7.8 8.9 14.3 18.9 22.8 26.1 27.4 22.2 18.0 11.5 7.5 15.9 
1977 4.0 4.3 9.9 15.5 19.5 22.7 28.1 27.8 25.0 19.7 14.6 9.5 16.7 
1978 6.2 4.9 8.7 14.5 19.7 23.8 28.8 29.6 25.2 18.6 13.1 9.0 16.8 
1979 7.2 8.5 9.2 13.9 19.0 24.5 26.5 29.1 24.7 19.7 13.9 9.2 17.1 
1980 5.7 4.8 8.5 13.9 19.5 23.9 25.8 26.6 23.3 18.7 13.7 6.8 15.9 
1981 3.7 5.1 9.3 14.4 18.5 23.2 28.3 27.4 23.1 17.6 11.1 7.6 15.8 
1982 5.3 5.5 9.7 14.0 20.5 22.3 24.7 27.2 22.9 18.4 14.5 8.6 16.1 
1983 6.1 5.6 8.7 16.5 20.1 22.5 26.7 29.4 24.9 17.9 12.6 6.9 16.5 
1984 3.6 3.3 6.0 13.7 18.9 24.0 27.5 29.4 24.1 17.8 13.6 7.9 15.8 
1985 4.3 6.6 9.3 15.5 20.1 22.5 27.6 29.2 25.3 19.0 12.8 6.6 16.6 
1986 4.2 3.8 8.3 14.8 18.6 23.0 26.4 28.2 24.5 17.0 12.4 8.9 15.8 
1987 6.2 6.5 8.9 14.2 19.3 23.8 27.6 28.7 24.4 19.6 13.4 8.7 16.8 
1988 7.2 5.0 8.4 14.3 19.0 23.3 26.0 27.9 24.8 17.8 11.5 7.6 16.1 
1989 7.8 7.6 9.5 15.5 18.8 22.6 26.7 28.0 24.9 18.2 14.1 8.5 16.9 
1990 5.7 8.7 10.4 14.9 19.1 24.5 28.0 29.5 25.4 18.9 14.8 9.4 17.4 
1991 6.4 5.8 10.2 15.9 19.2 24.4 28.1 28.1 25.6 18.7 13.3 9.8 17.1 
1992 7.4 6.5 10.5 15.3 18.3 22.4 27.0 28.2 24.5 19.2 13.4 9.6 16.9 
1993 6.9 7.5 8.7 14.4 18.9 22.7 25.4 26.6 23.3 17.9 14.7 8.4 16.3 
1994 6.1 6.2 8.3 16.5 20.7 24.2 29.9 30.2 26.0 20.8 14.6 9.3 17.7 
1995 6.1 6.2 9.8 14.6 18.9 22.1 27.5 30.3 24.2 19.9 12.1 7.2 16.6 
1996 6.3 5.2 8.9 12.7 19.6 23.4 27.5 28.3 23.3 18.5 13.7 8.7 16.3 
1997 6.0 5.8 10.1 15.1 19.9 23.7 26.7 28.5 24.3 18.2 14.1 8.9 16.8 
1998 5.9 7.8 10.6 17.7 21.6 23.3 27.8 29.4 25.6 20.8 13.7 9.8 17.8 
1999 6.4 5.9 10.6 14.7 20.5 23.5 26.8 29.1 27.2 20.1 14.1 8.7 17.3 
2000 7.0 4.9 8.9 14.6 20.7 23.3 28.7 29.6 25.8 19.7 14.6 8.8 17.2 
2001 5.2 6.6 9.7 15.5 20.6 24.0 29.2 28.8 24.4 19.5 13.2 8.3 17.1 
2002 7.2 7.3 11.6 16.6 20.0 23.6 29.0 29.0 25.1 18.9 11.1 8.2 17.3 
2003 5.1 6.8 8.4 15.9 20.2 23.7 25.3 28.3 25.9 18.1 15.5 9.1 16.9 
2004 5.8 7.9 10.2 16.4 21.1 24.8 29.5 28.4 26.2 19.0 15.2 10.2 17.9 
2005 6.2 6.1 9.2 16.2 19.5 24.9 27.5 28.7 26.1 19.8 13.7 5.9 17.0 
2006 5.5 6.7 8.6 13.6 19.7 24.3 27.2 29.8 24.6 20.4 14.8 9.1 17.0 
2007 7.5 8.7 10.1 14.6 19.8 23.6 25.9 29.9 27.2 20.0 13.7 9.6 17.6