Year | Value | 2022 | 16.152 | 2021 | 16.787 | 2020 | 17.46 | 2019 | 18.172 | 2018 | 18.926 | 2017 | 19.723 | 2016 | 20.564 | 2015 | 21.434 | 2014 | 22.33 | 2013 | 23.251 | 2012 | 24.198 | 2011 | 25.173 | 2010 | 26.247 | 2009 | 27.458 | 2008 | 28.7 | 2007 | 29.98 | 2006 | 31.29 | 2005 | 32.63 | 2004 | 33.997 | 2003 | 35.395 | 2002 | 36.629 | 2001 | 37.435 | 2000 | 38.247 | 1999 | 39.067 | 1998 | 39.893 | 1997 | 40.724 | 1996 | 41.559 | 1995 | 42.402 | 1994 | 43.248 | 1993 | 43.963 | 1992 | 44.233 | 1991 | 44.503 | 1990 | 44.774 | 1989 | 45.045 | 1988 | 45.316 | 1987 | 45.588 | 1986 | 45.86 | 1985 | 46.132 | 1984 | 46.404 | 1983 | 46.677 | 1982 | 46.95 | 1981 | 47.599 | 1980 | 48.71 | 1979 | 49.825 | 1978 | 50.939 | 1977 | 52.052 | 1976 | 53.162 | 1975 | 54.271 | 1974 | 55.374 | 1973 | 56.473 | 1972 | 57.563 | 1971 | 58.649 | 1970 | 59.726 | 1969 | 60.793 | 1968 | 61.847 | 1967 | 62.894 | 1966 | 63.927 | 1965 | 64.948 | 1964 | 65.954 | 1963 | 66.948 | 1962 | 67.926 | 1961 | 68.888 | 1960 | 69.809 |
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