| Year | Value | | 2022 | 70,624 | | 2021 | 69,023 | | 2020 | 70,335 | | 2019 | 72,796 | | 2018 | 73,337 | | 2017 | 73,035 | | 2016 | 72,205 | | 2015 | 70,144 | | 2014 | 66,536 | | 2013 | 60,221 | | 2012 | 51,005 | | 2011 | 41,768 | | 2010 | 34,804 | | 2009 | 31,779 | | 2008 | 31,440 | | 2007 | 31,038 | | 2006 | 30,395 | | 2005 | 29,466 | | 2004 | 28,409 | | 2003 | 28,221 | | 2002 | 28,854 | | 2001 | 29,273 | | 2000 | 29,380 | | 1999 | 29,184 | | 1998 | 28,737 | | 1997 | 28,109 | | 1996 | 27,350 | | 1995 | 26,498 | | 1994 | 25,577 | | 1993 | 23,992 | | 1992 | 21,873 | | 1991 | 19,997 | | 1990 | 18,396 | | 1989 | 17,045 | | 1988 | 15,908 | | 1987 | 14,954 | | 1986 | 14,163 | | 1985 | 13,498 | | 1984 | 12,904 | | 1983 | 12,353 | | 1982 | 11,839 | | 1981 | 11,356 | | 1980 | 10,912 | | 1979 | 10,488 | | 1978 | 10,075 | | 1977 | 9,687 | | 1976 | 9,342 | | 1975 | 9,060 | | 1974 | 8,840 | | 1973 | 8,694 | | 1972 | 8,600 | | 1971 | 8,506 | | 1970 | 8,403 | | 1969 | 8,297 | | 1968 | 8,187 | | 1967 | 8,075 | | 1966 | 7,968 | | 1965 | 7,862 | | 1964 | 7,752 | | 1963 | 7,638 | | 1962 | 7,518 | | 1961 | 7,397 | | 1960 | 7,280 |
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