| Year | Value | | 2022 | 16,295 | | 2021 | 15,891 | | 2020 | 15,641 | | 2019 | 15,400 | | 2018 | 15,070 | | 2017 | 14,778 | | 2016 | 14,496 | | 2015 | 14,260 | | 2014 | 13,909 | | 2013 | 13,560 | | 2012 | 13,275 | | 2011 | 12,930 | | 2010 | 12,467 | | 2009 | 11,962 | | 2008 | 11,498 | | 2007 | 11,061 | | 2006 | 10,648 | | 2005 | 10,305 | | 2004 | 9,950 | | 2003 | 9,651 | | 2002 | 9,376 | | 2001 | 9,063 | | 2000 | 8,751 | | 1999 | 8,531 | | 1998 | 8,568 | | 1997 | 8,736 | | 1996 | 8,864 | | 1995 | 8,846 | | 1994 | 8,696 | | 1993 | 8,508 | | 1992 | 8,296 | | 1991 | 8,055 | | 1990 | 7,798 | | 1989 | 7,550 | | 1988 | 7,239 | | 1987 | 6,927 | | 1986 | 6,676 | | 1985 | 6,404 | | 1984 | 6,150 | | 1983 | 5,962 | | 1982 | 5,753 | | 1981 | 5,509 | | 1980 | 5,299 | | 1979 | 5,059 | | 1978 | 4,829 | | 1977 | 4,635 | | 1976 | 4,467 | | 1975 | 4,333 | | 1974 | 4,167 | | 1973 | 3,985 | | 1972 | 3,818 | | 1971 | 3,708 | | 1970 | 3,611 | | 1969 | 3,509 | | 1968 | 3,446 | | 1967 | 3,384 | | 1966 | 3,306 | | 1965 | 3,235 | | 1964 | 3,147 | | 1963 | 3,044 | | 1962 | 2,967 | | 1961 | 2,875 | | 1960 | 2,779 |
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