| Year | Value | | 2022 | 129,368 | | 2021 | 124,540 | | 2020 | 119,133 | | 2019 | 113,224 | | 2018 | 108,009 | | 2017 | 103,857 | | 2016 | 100,736 | | 2015 | 98,269 | | 2014 | 96,190 | | 2013 | 95,014 | | 2012 | 95,287 | | 2011 | 96,074 | | 2010 | 96,553 | | 2009 | 97,449 | | 2008 | 98,691 | | 2007 | 100,167 | | 2006 | 102,637 | | 2005 | 106,714 | | 2004 | 112,469 | | 2003 | 119,409 | | 2002 | 126,805 | | 2001 | 134,685 | | 2000 | 142,377 | | 1999 | 148,533 | | 1998 | 152,390 | | 1997 | 153,645 | | 1996 | 152,116 | | 1995 | 148,375 | | 1994 | 144,808 | | 1993 | 142,331 | | 1992 | 141,897 | | 1991 | 138,881 | | 1990 | 131,152 | | 1989 | 121,173 | | 1988 | 112,073 | | 1987 | 105,657 | | 1986 | 98,415 | | 1985 | 89,603 | | 1984 | 79,276 | | 1983 | 69,224 | | 1982 | 62,181 | | 1981 | 60,727 | | 1980 | 66,011 | | 1979 | 76,578 | | 1978 | 88,825 | | 1977 | 99,291 | | 1976 | 106,297 | | 1975 | 109,752 | | 1974 | 109,659 | | 1973 | 104,777 | | 1972 | 96,682 | | 1971 | 89,849 | | 1970 | 86,206 | | 1969 | 84,908 | | 1968 | 86,023 | | 1967 | 88,728 | | 1966 | 89,864 | | 1965 | 87,689 | | 1964 | 82,824 | | 1963 | 75,635 | | 1962 | 66,589 | | 1961 | 57,740 | | 1960 | 50,449 |
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