| Year | Value | | 2022 | 16,879 | | 2021 | 15,546 | | 2020 | 14,478 | | 2019 | 13,689 | | 2018 | 13,133 | | 2017 | 12,792 | | 2016 | 12,516 | | 2015 | 12,160 | | 2014 | 11,638 | | 2013 | 10,914 | | 2012 | 10,054 | | 2011 | 9,182 | | 2010 | 8,457 | | 2009 | 7,923 | | 2008 | 7,553 | | 2007 | 7,319 | | 2006 | 7,122 | | 2005 | 6,921 | | 2004 | 6,702 | | 2003 | 6,475 | | 2002 | 6,251 | | 2001 | 6,031 | | 2000 | 5,822 | | 1999 | 5,627 | | 1998 | 5,450 | | 1997 | 5,281 | | 1996 | 5,119 | | 1995 | 4,967 | | 1994 | 4,821 | | 1993 | 4,681 | | 1992 | 4,547 | | 1991 | 4,421 | | 1990 | 4,305 | | 1989 | 4,198 | | 1988 | 4,094 | | 1987 | 3,993 | | 1986 | 3,891 | | 1985 | 3,785 | | 1984 | 3,670 | | 1983 | 3,554 | | 1982 | 3,415 | | 1981 | 3,261 | | 1980 | 3,141 | | 1979 | 3,087 | | 1978 | 3,086 | | 1977 | 3,107 | | 1976 | 3,179 | | 1975 | 3,285 | | 1974 | 3,391 | | 1973 | 3,500 | | 1972 | 3,613 | | 1971 | 3,721 | | 1970 | 3,815 | | 1969 | 3,875 | | 1968 | 3,862 | | 1967 | 3,803 | | 1966 | 3,753 | | 1965 | 3,720 | | 1964 | 3,705 | | 1963 | 3,706 | | 1962 | 3,717 | | 1961 | 3,722 | | 1960 | 3,716 |
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