| Year | Value | | 2022 | 14,147 | | 2021 | 14,206 | | 2020 | 14,165 | | 2019 | 13,984 | | 2018 | 13,717 | | 2017 | 13,434 | | 2016 | 13,145 | | 2015 | 12,829 | | 2014 | 12,493 | | 2013 | 12,154 | | 2012 | 11,814 | | 2011 | 11,347 | | 2010 | 10,834 | | 2009 | 10,405 | | 2008 | 9,951 | | 2007 | 9,414 | | 2006 | 8,817 | | 2005 | 8,209 | | 2004 | 7,732 | | 2003 | 7,557 | | 2002 | 7,437 | | 2001 | 7,176 | | 2000 | 6,898 | | 1999 | 6,582 | | 1998 | 6,160 | | 1997 | 5,490 | | 1996 | 5,022 | | 1995 | 4,851 | | 1994 | 4,791 | | 1993 | 4,792 | | 1992 | 4,579 | | 1991 | 4,279 | | 1990 | 4,849 | | 1989 | 5,448 | | 1988 | 5,171 | | 1987 | 4,878 | | 1986 | 4,583 | | 1985 | 4,301 | | 1984 | 4,028 | | 1983 | 3,985 | | 1982 | 3,988 | | 1981 | 3,845 | | 1980 | 3,773 | | 1979 | 3,760 | | 1978 | 3,789 | | 1977 | 3,844 | | 1976 | 3,922 | | 1975 | 4,020 | | 1974 | 4,005 | | 1973 | 3,875 | | 1972 | 3,753 | | 1971 | 3,634 | | 1970 | 3,515 | | 1969 | 3,398 | | 1968 | 3,282 | | 1967 | 3,166 | | 1966 | 3,056 | | 1965 | 2,953 | | 1964 | 2,857 | | 1963 | 2,766 | | 1962 | 2,695 | | 1961 | 2,640 | | 1960 | 2,583 |
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