| Year | Value | | 2022 | 24,468 | | 2021 | 23,547 | | 2020 | 22,641 | | 2019 | 21,729 | | 2018 | 20,826 | | 2017 | 19,952 | | 2016 | 19,111 | | 2015 | 18,307 | | 2014 | 17,538 | | 2013 | 16,800 | | 2012 | 16,095 | | 2011 | 15,426 | | 2010 | 14,786 | | 2009 | 14,169 | | 2008 | 13,587 | | 2007 | 13,058 | | 2006 | 12,589 | | 2005 | 12,275 | | 2004 | 12,166 | | 2003 | 12,160 | | 2002 | 12,094 | | 2001 | 11,898 | | 2000 | 11,607 | | 1999 | 11,192 | | 1998 | 10,676 | | 1997 | 10,131 | | 1996 | 9,670 | | 1995 | 9,346 | | 1994 | 9,176 | | 1993 | 8,938 | | 1992 | 9,070 | | 1991 | 9,115 | | 1990 | 8,341 | | 1989 | 7,506 | | 1988 | 6,922 | | 1987 | 6,468 | | 1986 | 6,050 | | 1985 | 5,700 | | 1984 | 5,421 | | 1983 | 5,204 | | 1982 | 5,014 | | 1981 | 4,808 | | 1980 | 4,556 | | 1979 | 4,248 | | 1978 | 3,898 | | 1977 | 3,534 | | 1976 | 3,194 | | 1975 | 2,904 | | 1974 | 2,663 | | 1973 | 2,465 | | 1972 | 2,294 | | 1971 | 2,138 | | 1970 | 1,995 | | 1969 | 1,865 | | 1968 | 1,755 | | 1967 | 1,664 | | 1966 | 1,575 | | 1965 | 1,488 | | 1964 | 1,407 | | 1963 | 1,332 | | 1962 | 1,268 | | 1961 | 1,211 | | 1960 | 1,161 |
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