Year | Value | 2022 | 49.841 | 2021 | 49.425 | 2020 | 49.02 | 2019 | 48.626 | 2018 | 48.245 | 2017 | 47.876 | 2016 | 47.518 | 2015 | 47.173 | 2014 | 46.84 | 2013 | 46.519 | 2012 | 46.199 | 2011 | 45.878 | 2010 | 45.558 | 2009 | 45.239 | 2008 | 44.92 | 2007 | 44.601 | 2006 | 44.282 | 2005 | 43.965 | 2004 | 43.648 | 2003 | 43.33 | 2002 | 43.014 | 2001 | 42.698 | 2000 | 42.384 | 1999 | 42.069 | 1998 | 41.755 | 1997 | 41.442 | 1996 | 41.13 | 1995 | 40.817 | 1994 | 40.506 | 1993 | 40.196 | 1992 | 39.887 | 1991 | 39.578 | 1990 | 39.249 | 1989 | 38.915 | 1988 | 38.583 | 1987 | 38.25 | 1986 | 37.919 | 1985 | 37.589 | 1984 | 37.261 | 1983 | 36.933 | 1982 | 36.607 | 1981 | 36.282 | 1980 | 35.543 | 1979 | 34.67 | 1978 | 33.808 | 1977 | 32.957 | 1976 | 32.118 | 1975 | 31.288 | 1974 | 30.471 | 1973 | 29.666 | 1972 | 28.875 | 1971 | 28.094 | 1970 | 27.201 | 1969 | 26.283 | 1968 | 25.387 | 1967 | 24.509 | 1966 | 23.652 | 1965 | 22.817 | 1964 | 22.004 | 1963 | 21.209 | 1962 | 20.437 | 1961 | 19.686 | 1960 | 19.04 |
|