1950 7.5 6.6 8.9 13.8 18.4 21.3 26.7 26.5 23.2 17.3 12.6 6.4 15.8 
1951 4.7 6.9 7.9 12.5 17.6 20.6 24.2 27.2 20.8 17.2 12.0 8.6 15.0 
1952 5.4 5.1 8.2 13.7 17.3 21.1 25.4 26.9 22.7 15.9 13.9 7.1 15.2 
1953 5.1 6.4 9.4 12.7 18.1 21.5 26.9 27.8 23.5 18.3 12.3 9.6 16.0 
1954 7.8 7.5 8.8 14.5 18.7 20.6 24.8 27.6 23.6 16.7 13.4 8.0 16.0 
1955 4.7 7.4 10.7 14.8 18.2 23.4 27.3 26.6 23.7 16.7 10.9 8.3 16.1 
1956 5.6 4.8 9.4 13.8 17.1 22.5 27.2 26.0 23.6 18.1 10.9 5.8 15.4 
1957 7.0 4.9 8.0 14.4 18.1 21.3 26.3 26.5 20.8 16.8 12.7 8.2 15.4 
1958 5.5 7.2 9.6 15.1 18.2 22.5 27.8 26.5 24.0 17.5 12.5 9.6 16.3 
1959 5.1 9.4 10.7 14.4 18.6 22.0 27.0 27.8 24.2 18.4 13.6 8.8 16.7 
1960 5.4 7.8 10.7 13.3 18.5 22.5 27.8 27.9 23.7 17.7 13.3 6.8 16.3 
1961 4.4 5.4 10.2 14.4 19.0 22.8 28.3 28.1 25.4 19.7 13.8 8.2 16.6 
1962 4.7 6.7 9.0 13.2 18.1 21.2 26.7 27.1 23.7 17.4 12.2 8.4 15.7 
1963 2.6 3.5 8.7 14.3 19.1 22.0 27.0 27.0 22.7 16.6 12.7 8.9 15.4 
1964 7.5 5.0 9.5 17.4 19.1 21.8 28.5 28.3 24.5 18.3 12.1 7.9 16.7 
1965 5.2 6.3 7.7 12.5 18.0 21.2 27.1 27.2 21.0 16.8 14.0 7.5 15.4 
1966 5.5 8.1 10.8 14.1 18.2 21.9 26.5 29.0 23.0 17.9 12.2 6.9 16.2 
1967 5.2 6.1 10.1 14.8 19.6 23.2 27.1 28.8 24.1 17.7 13.1 5.5 16.3 
1968 5.8 3.0 9.4 14.2 17.6 21.4 25.2 26.8 23.4 17.1 13.0 10.6 15.6 
1969 6.8 6.7 8.4 14.7 18.8 21.6 26.2 28.2 25.2 17.4 12.4 7.1 16.1 
1970 4.4 7.7 7.0 13.3 18.7 20.8 26.2 28.1 25.3 19.5 12.9 8.1 16.0 
1971 5.5 6.4 8.9 14.3 18.5 22.8 28.2 26.6 23.2 17.1 13.2 8.5 16.1 
1972 7.9 6.8 9.4 13.8 17.9 21.4 26.1 26.4 22.2 17.4 12.7 8.5 15.9 
1973 7.7 7.9 10.1 15.8 19.0 22.0 27.9 28.5 22.7 17.9 12.1 6.2 16.5 
1974 5.6 6.0 9.1 14.9 19.3 21.7 25.1 27.0 22.8 18.6 12.4 8.3 15.9 
1975 6.1 6.0 9.6 14.5 18.4 22.3 28.3 28.1 25.6 19.7 13.3 7.8 16.6 
1976 5.1 8.6 9.3 14.2 18.5 21.4 24.7 27.4 21.3 17.7 11.0 7.4 15.6 
1977 3.7 4.7 10.3 15.3 18.5 21.8 27.5 26.0 24.1 19.4 14.0 9.8 16.3 
1978 7.0 6.0 9.4 14.5 19.3 23.8 28.7 28.3 24.5 18.0 13.2 9.4 16.8 
1979 7.7 8.0 9.9 14.0 18.1 23.6 26.3 27.9 24.6 19.0 12.5 9.3 16.7 
1980 6.2 5.1 9.6 14.0 18.7 23.1 24.9 24.5 22.4 18.1 13.5 6.4 15.5 
1981 4.0 6.1 10.2 14.6 18.6 22.8 28.5 27.4 23.1 18.1 11.7 8.2 16.1 
1982 5.9 6.7 10.7 14.2 20.3 22.1 24.8 27.1 22.4 18.7 14.9 8.6 16.4 
1983 6.7 6.0 10.1 16.3 19.4 22.1 26.9 28.1 24.8 19.1 12.4 7.4 16.6 
1984 4.1 4.4 7.6 14.5 18.0 23.8 27.8 28.6 23.7 18.1 14.4 8.3 16.1 
1985 4.7 7.0 10.0 14.5 19.5 22.0 28.0 29.3 25.4 19.3 12.7 6.7 16.6 
1986 4.5 4.7 9.4 15.2 18.9 22.9 25.6 27.8 23.7 17.0 12.6 9.6 16.0 
1987 7.3 7.9 9.7 14.4 19.0 22.5 26.8 27.2 22.8 19.9 14.4 9.0 16.7 
1988 7.6 6.4 8.9 14.4 19.2 22.5 26.5 26.8 23.8 18.5 12.2 8.5 16.3 
1989 9.1 8.7 10.3 16.2 18.4 21.8 26.3 27.3 24.3 18.3 13.7 9.6 17.0 
1990 6.0 10.2 11.4 14.8 19.3 24.2 28.3 29.6 25.4 18.7 15.2 8.7 17.7 
1991 7.0 6.1 10.4 14.6 18.3 23.5 27.4 26.2 24.4 18.3 13.1 10.0 16.6 
1992 7.8 7.6 10.8 15.4 18.9 21.4 26.5 26.7 24.6 18.5 13.2 10.0 16.8 
1993 7.5 8.3 9.8 14.6 18.8 22.9 25.1 25.2 22.6 17.7 14.4 8.9 16.3 
1994 7.1 7.2 8.9 15.8 20.5 22.3 29.6 29.8 24.6 19.7 15.2 10.1 17.6 
1995 6.9 7.1 10.1 14.4 18.4 21.7 27.4 29.3 23.5 19.2 12.3 7.4 16.5 
1996 6.5 6.1 9.9 12.5 19.4 23.9 27.1 28.2 23.8 19.0 14.2 8.6 16.6 
1997 6.2 7.7 11.3 15.3 20.4 23.6 26.6 28.0 23.3 18.6 14.9 9.5 17.1 
1998 6.6 9.4 10.9 17.6 21.1 22.9 27.6 29.2 25.7 20.8 14.3 10.6 18.1 
1999 7.3 7.2 11.3 14.8 19.7 23.2 25.3 27.6 26.2 19.9 13.8 8.6 17.1 
2000 7.7 6.1 10.4 15.1 19.4 23.0 28.2 28.6 24.4 19.7 14.5 9.6 17.2 
2001 6.2 7.7 10.9 15.3 20.1 23.6 27.8 28.5 24.0 19.8 13.2 8.3 17.1 
2002 7.9 8.4 12.5 16.6 19.3 23.6 27.9 27.8 24.4 18.8 11.5 9.1 17.3 
2003 5.9 8.3 9.9 16.1 20.0 23.2 25.5 27.2 25.6 18.8 16.1 9.3 17.2 
2004 6.1 9.0 10.9 16.2 20.5 24.0 28.7 28.6 24.6 19.0 15.1 10.7 17.8 
2005 6.4 6.1 9.6 16.7 19.4 24.8 27.6 28.4 26.0 20.5 14.4 6.0 17.2 
2006 6.9 7.7 10.1 14.6 19.2 23.2 27.3 29.0 23.3 20.6 15.0 9.5 17.2 
2007 7.6 9.8 11.3 15.1 20.4 23.8 26.3 29.4 27.0 20.9 14.1 9.8 18.0