| Year | Value | | 2022 | 15,451 | | 2021 | 14,789 | | 2020 | 14,204 | | 2019 | 13,725 | | 2018 | 13,356 | | 2017 | 13,077 | | 2016 | 12,914 | | 2015 | 12,805 | | 2014 | 12,642 | | 2013 | 12,407 | | 2012 | 12,108 | | 2011 | 11,757 | | 2010 | 11,365 | | 2009 | 10,960 | | 2008 | 10,564 | | 2007 | 10,183 | | 2006 | 9,833 | | 2005 | 9,596 | | 2004 | 9,574 | | 2003 | 9,702 | | 2002 | 9,822 | | 2001 | 9,879 | | 2000 | 9,873 | | 1999 | 9,802 | | 1998 | 9,605 | | 1997 | 9,338 | | 1996 | 9,097 | | 1995 | 8,853 | | 1994 | 8,673 | | 1993 | 8,587 | | 1992 | 8,900 | | 1991 | 9,151 | | 1990 | 8,903 | | 1989 | 8,575 | | 1988 | 8,231 | | 1987 | 7,891 | | 1986 | 7,557 | | 1985 | 7,231 | | 1984 | 6,915 | | 1983 | 6,608 | | 1982 | 6,310 | | 1981 | 6,023 | | 1980 | 5,748 | | 1979 | 5,483 | | 1978 | 5,230 | | 1977 | 4,990 | | 1976 | 4,765 | | 1975 | 4,552 | | 1974 | 4,352 | | 1973 | 4,162 | | 1972 | 3,984 | | 1971 | 3,818 | | 1970 | 3,664 | | 1969 | 3,520 | | 1968 | 3,385 | | 1967 | 3,260 | | 1966 | 3,143 | | 1965 | 3,033 | | 1964 | 2,931 | | 1963 | 2,837 | | 1962 | 2,748 | | 1961 | 2,666 | | 1960 | 2,592 |
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