| Year | Value | | 2022 | 99,564 | | 2021 | 102,031 | | 2020 | 104,031 | | 2019 | 106,383 | | 2018 | 108,960 | | 2017 | 111,596 | | 2016 | 113,886 | | 2015 | 115,941 | | 2014 | 117,567 | | 2013 | 118,382 | | 2012 | 118,630 | | 2011 | 118,365 | | 2010 | 117,716 | | 2009 | 115,833 | | 2008 | 113,156 | | 2007 | 109,743 | | 2006 | 105,668 | | 2005 | 101,151 | | 2004 | 96,214 | | 2003 | 90,989 | | 2002 | 86,009 | | 2001 | 81,060 | | 2000 | 76,059 | | 1999 | 70,548 | | 1998 | 63,561 | | 1997 | 55,270 | | 1996 | 46,778 | | 1995 | 39,809 | | 1994 | 36,537 | | 1993 | 36,858 | | 1992 | 41,070 | | 1991 | 49,005 | | 1990 | 57,068 | | 1989 | 62,086 | | 1988 | 65,173 | | 1987 | 66,719 | | 1986 | 67,057 | | 1985 | 66,539 | | 1984 | 66,087 | | 1983 | 65,700 | | 1982 | 65,391 | | 1981 | 65,062 | | 1980 | 64,379 | | 1979 | 63,352 | | 1978 | 61,434 | | 1977 | 58,062 | | 1976 | 53,228 | | 1975 | 47,475 | | 1974 | 41,464 | | 1973 | 35,692 | | 1972 | 30,888 | | 1971 | 27,130 | | 1970 | 24,385 | | 1969 | 22,864 | | 1968 | 22,294 | | 1967 | 22,335 | | 1966 | 22,662 | | 1965 | 22,956 | | 1964 | 23,108 | | 1963 | 23,021 | | 1962 | 22,773 | | 1961 | 22,067 | | 1960 | 21,487 |
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