| Year | Value | | 2022 | 48,712 | | 2021 | 45,628 | | 2020 | 41,904 | | 2019 | 37,450 | | 2018 | 32,327 | | 2017 | 27,560 | | 2016 | 23,193 | | 2015 | 19,257 | | 2014 | 15,765 | | 2013 | 12,698 | | 2012 | 10,025 | | 2011 | 7,721 | | 2010 | 5,786 | | 2009 | 5,313 | | 2008 | 6,318 | | 2007 | 7,468 | | 2006 | 8,285 | | 2005 | 8,424 | | 2004 | 8,072 | | 2003 | 7,650 | | 2002 | 7,290 | | 2001 | 7,005 | | 2000 | 6,771 | | 1999 | 6,548 | | 1998 | 6,309 | | 1997 | 6,051 | | 1996 | 5,797 | | 1995 | 5,625 | | 1994 | 5,507 | | 1993 | 5,356 | | 1992 | 5,166 | | 1991 | 4,946 | | 1990 | 4,724 | | 1989 | 4,534 | | 1988 | 4,393 | | 1987 | 4,301 | | 1986 | 4,228 | | 1985 | 4,010 | | 1984 | 3,663 | | 1983 | 3,394 | | 1982 | 3,262 | | 1981 | 3,241 | | 1980 | 3,138 | | 1979 | 2,929 | | 1978 | 2,824 | | 1977 | 2,897 | | 1976 | 3,069 | | 1975 | 2,979 | | 1974 | 2,557 | | 1973 | 2,093 | | 1972 | 1,685 | | 1971 | 1,393 | | 1970 | 1,210 | | 1969 | 1,094 | | 1968 | 991 | | 1967 | 928 | | 1966 | 911 | | 1965 | 898 | | 1964 | 885 | | 1963 | 875 | | 1962 | 868 | | 1961 | 861 | | 1960 | 855 |
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