Year | Value | 2022 | 17.958 | 2021 | 18.575 | 2020 | 19.229 | 2019 | 19.924 | 2018 | 20.66 | 2017 | 21.44 | 2016 | 22.265 | 2015 | 23.138 | 2014 | 24.059 | 2013 | 25.03 | 2012 | 26.054 | 2011 | 27.132 | 2010 | 28.264 | 2009 | 29.425 | 2008 | 30.61 | 2007 | 31.826 | 2006 | 33.065 | 2005 | 34.328 | 2004 | 35.612 | 2003 | 36.92 | 2002 | 38.247 | 2001 | 39.59 | 2000 | 40.948 | 1999 | 41.843 | 1998 | 42.736 | 1997 | 43.633 | 1996 | 44.533 | 1995 | 45.439 | 1994 | 46.347 | 1993 | 47.257 | 1992 | 48.168 | 1991 | 49.083 | 1990 | 49.997 | 1989 | 50.911 | 1988 | 51.823 | 1987 | 52.736 | 1986 | 53.647 | 1985 | 54.555 | 1984 | 55.458 | 1983 | 55.844 | 1982 | 56.197 | 1981 | 56.55 | 1980 | 56.901 | 1979 | 57.253 | 1978 | 57.604 | 1977 | 57.954 | 1976 | 58.302 | 1975 | 58.651 | 1974 | 58.998 | 1973 | 59.345 | 1972 | 59.932 | 1971 | 60.555 | 1970 | 61.173 | 1969 | 61.788 | 1968 | 62.399 | 1967 | 63.007 | 1966 | 63.61 | 1965 | 64.209 | 1964 | 64.803 | 1963 | 65.394 | 1962 | 65.596 | 1961 | 65.671 | 1960 | 65.746 |
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