| Year | Value | | 2022 | 12,965 | | 2021 | 12,512 | | 2020 | 12,085 | | 2019 | 11,696 | | 2018 | 11,331 | | 2017 | 10,950 | | 2016 | 10,520 | | 2015 | 10,011 | | 2014 | 9,447 | | 2013 | 8,878 | | 2012 | 8,371 | | 2011 | 8,008 | | 2010 | 7,798 | | 2009 | 7,680 | | 2008 | 7,600 | | 2007 | 7,524 | | 2006 | 7,447 | | 2005 | 7,377 | | 2004 | 7,309 | | 2003 | 7,104 | | 2002 | 6,735 | | 2001 | 6,354 | | 2000 | 6,041 | | 1999 | 5,816 | | 1998 | 5,654 | | 1997 | 5,512 | | 1996 | 5,338 | | 1995 | 5,114 | | 1994 | 4,935 | | 1993 | 4,845 | | 1992 | 4,763 | | 1991 | 4,671 | | 1990 | 4,583 | | 1989 | 4,488 | | 1988 | 4,379 | | 1987 | 4,276 | | 1986 | 4,174 | | 1985 | 4,049 | | 1984 | 3,910 | | 1983 | 3,767 | | 1982 | 3,631 | | 1981 | 3,505 | | 1980 | 3,403 | | 1979 | 3,336 | | 1978 | 3,304 | | 1977 | 3,305 | | 1976 | 3,343 | | 1975 | 3,419 | | 1974 | 3,527 | | 1973 | 3,646 | | 1972 | 3,744 | | 1971 | 3,758 | | 1970 | 3,686 | | 1969 | 3,580 | | 1968 | 3,454 | | 1967 | 3,331 | | 1966 | 3,233 | | 1965 | 3,158 | | 1964 | 3,125 | | 1963 | 3,165 | | 1962 | 3,166 | | 1961 | 3,060 | | 1960 | 2,932 |
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