Year |
Average |
Effective |
1940 |
2.5 |
2.4 |
1941 |
2.5 |
2.4 |
1942 |
2.2 |
2.3 |
1943 |
1.9 |
2.1 |
1944 |
1.9 |
2.0 |
1945 |
1.9 |
2.1 |
1946 |
1.9 |
2.0 |
1947 |
2.0 |
1.9 |
1948 |
2.1 |
2.8 |
1949 |
2.1 |
1.3 |
1950 |
2.1 |
2.0 |
1951 |
2.2 |
2.9 |
1952 |
2.3 |
2.2 |
1953 |
2.4 |
2.3 |
1954 |
2.3 |
2.3 |
1955 |
2.3 |
2.2 |
1956 |
2.5 |
2.4 |
1957 |
2.5 |
2.5 |
1958 |
2.6 |
2.5 |
1959 |
2.6 |
2.6 |
1960 |
2.9 |
2.6 |
1961 |
3.8 |
2.8 |
1962 |
3.9 |
2.8 |
1963 |
3.9 |
2.9 |
1964 |
4.1 |
3.1 |
1965 |
4.2 |
3.2 |
1966 |
4.9 |
3.5 |
1967 |
5.0 |
3.8 |
1968 |
5.5 |
4.0 |
1969 |
6.6 |
4.4 |
|
Year |
Average |
Effective |
1970 |
7.3 |
5.1 |
1971 |
6.0 |
5.3 |
1972 |
5.9 |
5.4 |
1973 |
6.6 |
5.8 |
1974 |
7.5 |
6.2 |
1975 |
7.4 |
6.6 |
1976 |
7.1 |
6.7 |
1977 |
7.1 |
7.0 |
1978 |
8.2 |
7.2 |
1979 |
9.1 |
7.5 |
1980 |
11.0 |
8.6 |
1981 |
13.3 |
9.9 |
1982 |
12.8 |
11.2 |
1983 |
11.0 |
10.8 |
1984 |
12.4 |
11.6 |
1985 |
10.8 |
11.2 |
1986 |
8.0 |
11.1 |
1987 |
8.4 |
10.1 |
1988 |
8.8 |
9.8 |
1989 |
8.7 |
9.6 |
1990 |
8.6 |
9.3 |
1991 |
8.0 |
9.1 |
1992 |
7.1 |
8.7 |
1993 |
6.1 |
8.3 |
1994 |
7.1 |
8.0 |
1995 |
6.9 |
7.8 |
1996 |
6.6 |
7.6 |
1997 |
6.6 |
7.5 |
1998 |
5.6 |
7.2 |
1999 |
5.9 |
6.9 |
|
Year |
Average |
Effective |
2000 |
6.2 |
6.9 |
2001 |
5.2 |
6.6 |
2002 |
4.9 |
6.4 |
2003 |
4.1 |
6.0 |
2004 |
4.3 |
5.7 |
2005 |
4.3 |
5.5 |
2006 |
4.8 |
5.3 |
2007 |
4.7 |
5.3 |
2008 |
3.6 |
5.1 |
|