| Year | Value | | 2022 | 13,693 | | 2021 | 13,712 | | 2020 | 13,661 | | 2019 | 13,530 | | 2018 | 13,320 | | 2017 | 13,024 | | 2016 | 12,659 | | 2015 | 12,252 | | 2014 | 11,828 | | 2013 | 11,394 | | 2012 | 10,968 | | 2011 | 10,566 | | 2010 | 10,198 | | 2009 | 9,821 | | 2008 | 9,374 | | 2007 | 8,895 | | 2006 | 8,467 | | 2005 | 8,119 | | 2004 | 7,832 | | 2003 | 7,655 | | 2002 | 7,590 | | 2001 | 7,541 | | 2000 | 7,477 | | 1999 | 7,408 | | 1998 | 7,335 | | 1997 | 7,247 | | 1996 | 7,137 | | 1995 | 7,006 | | 1994 | 6,860 | | 1993 | 6,703 | | 1992 | 6,537 | | 1991 | 6,373 | | 1990 | 6,210 | | 1989 | 6,043 | | 1988 | 5,871 | | 1987 | 5,691 | | 1986 | 5,502 | | 1985 | 5,307 | | 1984 | 5,108 | | 1983 | 4,902 | | 1982 | 4,687 | | 1981 | 4,463 | | 1980 | 4,232 | | 1979 | 3,974 | | 1978 | 3,746 | | 1977 | 3,595 | | 1976 | 3,471 | | 1975 | 3,363 | | 1974 | 3,267 | | 1973 | 3,179 | | 1972 | 3,106 | | 1971 | 3,043 | | 1970 | 2,981 | | 1969 | 2,919 | | 1968 | 2,853 | | 1967 | 2,782 | | 1966 | 2,704 | | 1965 | 2,623 | | 1964 | 2,542 | | 1963 | 2,460 | | 1962 | 2,382 | | 1961 | 2,307 | | 1960 | 2,237 |
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