| Year | Value | | 2022 | 16,146 | | 2021 | 16,013 | | 2020 | 15,874 | | 2019 | 15,693 | | 2018 | 15,430 | | 2017 | 15,055 | | 2016 | 14,568 | | 2015 | 13,995 | | 2014 | 13,385 | | 2013 | 12,807 | | 2012 | 12,299 | | 2011 | 11,865 | | 2010 | 11,519 | | 2009 | 11,235 | | 2008 | 10,950 | | 2007 | 10,637 | | 2006 | 10,291 | | 2005 | 9,910 | | 2004 | 9,506 | | 2003 | 9,086 | | 2002 | 8,642 | | 2001 | 8,172 | | 2000 | 7,676 | | 1999 | 7,170 | | 1998 | 6,675 | | 1997 | 6,194 | | 1996 | 5,713 | | 1995 | 5,241 | | 1994 | 4,786 | | 1993 | 4,382 | | 1992 | 4,079 | | 1991 | 3,880 | | 1990 | 3,761 | | 1989 | 3,689 | | 1988 | 3,609 | | 1987 | 3,496 | | 1986 | 3,370 | | 1985 | 3,252 | | 1984 | 3,169 | | 1983 | 3,125 | | 1982 | 3,099 | | 1981 | 3,069 | | 1980 | 3,001 | | 1979 | 2,885 | | 1978 | 2,729 | | 1977 | 2,549 | | 1976 | 2,373 | | 1975 | 2,220 | | 1974 | 2,104 | | 1973 | 2,022 | | 1972 | 1,970 | | 1971 | 1,938 | | 1970 | 1,905 | | 1969 | 1,858 | | 1968 | 1,797 | | 1967 | 1,721 | | 1966 | 1,635 | | 1965 | 1,542 | | 1964 | 1,455 | | 1963 | 1,374 | | 1962 | 1,300 | | 1961 | 1,230 | | 1960 | 1,170 |
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