| Year | Value | | 2022 | 68,600 | | 2021 | 64,850 | | 2020 | 61,566 | | 2019 | 58,724 | | 2018 | 56,394 | | 2017 | 54,443 | | 2016 | 52,762 | | 2015 | 51,295 | | 2014 | 49,929 | | 2013 | 48,589 | | 2012 | 47,263 | | 2011 | 45,932 | | 2010 | 44,556 | | 2009 | 43,198 | | 2008 | 41,916 | | 2007 | 40,711 | | 2006 | 39,517 | | 2005 | 38,252 | | 2004 | 36,920 | | 2003 | 35,542 | | 2002 | 34,120 | | 2001 | 32,671 | | 2000 | 31,257 | | 1999 | 29,888 | | 1998 | 28,257 | | 1997 | 26,417 | | 1996 | 24,718 | | 1995 | 23,158 | | 1994 | 21,750 | | 1993 | 20,841 | | 1992 | 20,377 | | 1991 | 20,063 | | 1990 | 19,859 | | 1989 | 19,662 | | 1988 | 19,474 | | 1987 | 19,277 | | 1986 | 19,027 | | 1985 | 18,697 | | 1984 | 18,303 | | 1983 | 17,867 | | 1982 | 17,387 | | 1981 | 16,810 | | 1980 | 16,124 | | 1979 | 15,364 | | 1978 | 14,532 | | 1977 | 13,700 | | 1976 | 12,998 | | 1975 | 12,492 | | 1974 | 12,164 | | 1973 | 12,012 | | 1972 | 11,990 | | 1971 | 11,982 | | 1970 | 11,908 | | 1969 | 11,730 | | 1968 | 11,394 | | 1967 | 10,910 | | 1966 | 10,401 | | 1965 | 9,946 | | 1964 | 9,467 | | 1963 | 8,943 | | 1962 | 8,487 | | 1961 | 8,123 | | 1960 | 7,860 |
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