1950 5.0 4.7 7.7 13.9 19.2 21.8 26.5 26.2 23.8 15.8 11.1 5.4 15.1 
1951 3.3 4.5 8.8 13.3 18.0 21.2 24.3 26.7 20.7 17.3 11.4 7.3 14.7 
1952 4.3 2.6 7.4 13.3 18.1 21.3 24.3 26.8 22.7 17.3 12.0 5.3 14.6 
1953 3.3 4.2 9.4 12.7 17.8 20.6 24.7 25.0 22.2 17.2 10.4 7.5 14.6 
1954 4.2 5.6 8.4 14.9 17.6 18.3 22.3 27.0 24.6 15.5 11.7 7.1 14.8 
1955 3.8 6.2 8.7 13.6 18.2 22.7 27.6 26.3 22.3 17.6 11.0 7.9 15.5 
1956 4.2 4.3 8.6 13.1 17.6 22.3 24.2 25.4 22.7 17.3 11.8 5.0 14.7 
1957 5.7 4.3 6.8 14.3 17.1 19.8 24.4 27.3 20.8 17.2 12.9 8.0 14.9 
1958 5.0 6.0 8.4 13.9 18.0 22.0 24.9 25.8 23.2 16.0 11.1 7.9 15.2 
1959 3.7 7.3 8.9 15.3 18.5 20.4 26.1 26.7 24.1 17.6 12.3 7.0 15.7 
1960 5.0 6.6 9.5 12.8 17.8 21.5 25.8 26.4 23.6 16.8 12.3 6.7 15.4 
1961 3.6 4.5 8.2 14.9 19.8 22.6 27.4 26.8 25.3 18.3 12.7 7.2 15.9 
1962 4.5 5.9 8.2 14.1 18.4 20.9 25.1 28.1 24.5 16.7 11.3 7.0 15.4 
1963 3.2 4.8 7.6 13.9 18.4 21.8 25.7 26.6 21.4 16.3 12.1 8.1 15.0 
1964 5.4 4.2 7.6 15.3 18.9 21.5 25.5 27.8 22.3 15.9 11.1 7.5 15.3 
1965 4.4 4.7 6.9 11.1 17.2 21.6 24.2 26.7 22.2 16.9 12.7 7.0 14.6 
1966 4.6 7.2 9.6 13.6 17.9 20.1 24.4 26.9 23.2 18.9 12.9 6.6 15.5 
1967 4.4 4.9 9.5 14.5 20.0 23.0 26.3 28.0 22.6 16.9 12.1 6.7 15.7 
1968 5.7 4.3 10.0 14.1 17.5 22.0 24.7 26.6 21.9 16.3 14.1 10.2 15.6 
1969 5.7 5.7 7.9 14.6 19.6 21.8 25.0 27.2 22.8 17.3 12.8 7.2 15.6 
1970 4.5 6.0 5.5 13.0 19.6 20.7 25.4 27.4 24.0 17.2 12.3 6.8 15.2 
1971 5.1 5.9 8.3 13.5 17.4 21.3 25.8 26.7 21.1 15.5 11.9 7.9 15.0 
1972 6.6 5.1 9.7 13.4 18.6 21.4 25.2 26.6 23.1 18.5 12.3 8.1 15.7 
1973 6.3 6.9 7.8 15.3 17.9 19.8 26.1 28.5 23.2 17.4 12.1 6.6 15.7 
1974 4.4 5.1 7.3 14.8 19.3 21.9 23.4 27.1 22.8 17.8 11.7 6.7 15.2 
1975 4.7 5.1 7.9 14.3 18.6 21.6 25.6 27.3 25.2 17.3 12.7 6.7 15.6 
1976 5.4 6.8 9.0 13.0 17.7 21.5 23.9 25.1 22.0 17.5 11.2 7.3 15.0 
1977 3.4 4.9 9.3 15.1 18.7 20.9 25.8 25.0 24.3 18.7 14.8 8.9 15.8 
1978 5.6 4.2 8.7 13.9 19.0 23.8 27.8 28.9 22.2 17.3 12.9 8.5 16.1 
1979 6.6 8.4 9.9 13.9 18.6 24.4 25.2 27.4 24.1 19.6 14.3 10.1 16.9 
1980 5.6 5.2 8.2 13.6 19.2 23.6 23.8 23.4 23.0 18.2 13.0 7.7 15.4 
1981 4.4 5.3 9.0 13.9 17.5 20.2 26.3 26.2 21.8 17.6 10.4 7.6 15.0 
1982 5.8 5.5 9.9 14.0 20.7 21.4 23.1 27.1 22.3 18.0 14.3 9.5 16.0 
1983 6.2 6.1 8.6 15.9 19.7 20.5 23.8 27.5 23.1 17.7 12.3 7.1 15.7 
1984 3.7 3.0 5.9 11.6 17.2 21.8 26.2 28.6 23.5 17.7 12.2 7.7 14.9 
1985 4.1 6.5 7.8 14.2 19.1 20.2 26.3 27.9 23.1 17.9 13.3 7.4 15.7 
1986 4.5 4.3 7.8 13.9 17.9 21.1 23.9 26.8 23.7 17.1 12.3 8.5 15.2 
1987 5.8 6.8 9.3 14.4 19.3 22.1 27.0 27.3 23.3 18.9 12.8 8.1 16.3 
1988 7.7 4.9 8.4 14.3 18.2 22.3 22.4 27.0 22.8 17.5 11.4 8.4 15.4 
1989 8.1 7.5 9.6 15.6 17.7 20.7 24.1 27.1 25.2 17.5 14.2 9.2 16.4 
1990 5.0 7.8 10.6 14.7 19.2 23.5 25.7 28.6 24.8 19.2 15.1 10.0 17.0 
1991 6.3 6.5 9.5 15.4 18.8 23.6 26.7 25.5 23.9 18.1 13.0 9.2 16.4 
1992 6.8 6.9 9.7 15.1 17.3 20.6 25.5 27.0 23.3 17.3 13.0 9.4 16.0 
1993 6.2 7.7 8.7 13.4 18.1 21.7 22.5 24.8 22.9 17.5 14.1 8.5 15.5 
1994 5.5 6.6 8.1 15.8 19.5 22.4 28.3 28.9 24.8 20.2 13.4 9.0 16.9 
1995 6.3 6.5 8.9 15.0 19.1 20.4 26.4 29.4 23.7 19.5 12.7 7.7 16.3 
1996 6.6 5.4 9.2 12.7 18.1 22.6 26.2 26.0 22.4 18.0 13.2 9.3 15.8 
1997 6.8 7.0 10.5 15.2 19.2 22.7 26.6 27.0 22.9 18.7 14.3 9.2 16.7 
1998 5.3 7.0 10.1 16.3 20.5 21.5 25.3 27.2 24.4 20.1 13.9 9.0 16.7 
1999 6.6 6.7 10.1 15.0 19.9 22.8 25.9 28.5 26.2 19.5 14.2 9.0 17.0 
2000 7.6 6.0 9.4 14.5 19.8 22.5 27.7 28.3 25.6 18.8 13.3 8.8 16.9 
2001 4.9 6.6 9.8 15.7 19.5 23.1 28.5 26.4 23.2 18.7 13.1 8.4 16.5 
2002 7.4 7.9 12.2 16.1 18.4 21.6 28.0 28.0 23.1 19.0 11.6 7.2 16.7 
2003 5.5 6.4 8.7 15.1 18.8 23.2 22.8 26.0 24.2 17.8 14.4 9.2 16.0 
2004 6.3 8.5 9.8 16.4 19.6 23.7 28.5 27.2 25.1 17.5 15.6 9.9 17.3 
2005 6.1 6.2 9.0 15.1 17.7 23.2 25.6 28.1 24.7 19.2 13.3 6.4 16.2 
2006 5.1 6.7 9.8 13.6 19.0 22.5 25.6 27.5 23.5 19.5 14.4 9.5 16.4 
2007 7.6 8.6 10.8 13.7 19.8 23.2 24.4 29.0 25.2 19.0 13.3 9.0 17.0