| Year | Value | | 2022 | 12,635 | | 2021 | 12,155 | | 2020 | 11,703 | | 2019 | 11,284 | | 2018 | 10,892 | | 2017 | 10,522 | | 2016 | 10,183 | | 2015 | 9,886 | | 2014 | 9,618 | | 2013 | 9,369 | | 2012 | 9,144 | | 2011 | 8,944 | | 2010 | 8,770 | | 2009 | 8,621 | | 2008 | 8,459 | | 2007 | 8,291 | | 2006 | 8,101 | | 2005 | 7,932 | | 2004 | 7,812 | | 2003 | 7,688 | | 2002 | 7,577 | | 2001 | 7,479 | | 2000 | 7,366 | | 1999 | 7,235 | | 1998 | 7,089 | | 1997 | 6,925 | | 1996 | 6,740 | | 1995 | 6,519 | | 1994 | 6,243 | | 1993 | 6,200 | | 1992 | 6,191 | | 1991 | 5,945 | | 1990 | 5,696 | | 1989 | 5,443 | | 1988 | 5,187 | | 1987 | 4,944 | | 1986 | 4,717 | | 1985 | 4,500 | | 1984 | 4,293 | | 1983 | 4,103 | | 1982 | 3,931 | | 1981 | 3,778 | | 1980 | 3,646 | | 1979 | 3,538 | | 1978 | 3,450 | | 1977 | 3,374 | | 1976 | 3,304 | | 1975 | 3,239 | | 1974 | 3,177 | | 1973 | 3,118 | | 1972 | 3,059 | | 1971 | 2,997 | | 1970 | 2,931 | | 1969 | 2,854 | | 1968 | 2,766 | | 1967 | 2,674 | | 1966 | 2,593 | | 1965 | 2,533 | | 1964 | 2,496 | | 1963 | 2,478 | | 1962 | 2,473 | | 1961 | 2,474 | | 1960 | 2,472 |
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