| Year | Value | | 2022 | 30,769 | | 2021 | 30,003 | | 2020 | 29,282 | | 2019 | 28,466 | | 2018 | 27,605 | | 2017 | 26,849 | | 2016 | 26,172 | | 2015 | 25,576 | | 2014 | 25,104 | | 2013 | 24,727 | | 2012 | 24,136 | | 2011 | 23,269 | | 2010 | 22,309 | | 2009 | 21,198 | | 2008 | 19,943 | | 2007 | 19,048 | | 2006 | 18,557 | | 2005 | 18,061 | | 2004 | 17,632 | | 2003 | 17,269 | | 2002 | 16,886 | | 2001 | 16,507 | | 2000 | 16,100 | | 1999 | 15,656 | | 1998 | 15,236 | | 1997 | 14,838 | | 1996 | 14,499 | | 1995 | 14,201 | | 1994 | 13,840 | | 1993 | 13,423 | | 1992 | 12,950 | | 1991 | 12,512 | | 1990 | 12,165 | | 1989 | 11,859 | | 1988 | 11,559 | | 1987 | 11,239 | | 1986 | 10,930 | | 1985 | 10,629 | | 1984 | 10,337 | | 1983 | 10,055 | | 1982 | 9,777 | | 1981 | 9,506 | | 1980 | 9,244 | | 1979 | 8,988 | | 1978 | 8,739 | | 1977 | 8,499 | | 1976 | 8,258 | | 1975 | 8,014 | | 1974 | 7,776 | | 1973 | 7,540 | | 1972 | 7,311 | | 1971 | 7,090 | | 1970 | 6,881 | | 1969 | 6,680 | | 1968 | 6,485 | | 1967 | 6,292 | | 1966 | 6,097 | | 1965 | 5,899 | | 1964 | 5,697 | | 1963 | 5,491 | | 1962 | 5,281 | | 1961 | 5,069 | | 1960 | 4,857 |
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