| Year | Value | | 2022 | 11,813 | | 2021 | 11,952 | | 2020 | 11,969 | | 2019 | 11,820 | | 2018 | 11,534 | | 2017 | 11,123 | | 2016 | 10,584 | | 2015 | 9,950 | | 2014 | 9,293 | | 2013 | 8,626 | | 2012 | 7,959 | | 2011 | 7,335 | | 2010 | 6,707 | | 2009 | 6,042 | | 2008 | 5,440 | | 2007 | 5,022 | | 2006 | 4,828 | | 2005 | 4,812 | | 2004 | 4,852 | | 2003 | 4,800 | | 2002 | 4,619 | | 2001 | 4,365 | | 2000 | 4,095 | | 1999 | 3,850 | | 1998 | 3,628 | | 1997 | 3,416 | | 1996 | 3,216 | | 1995 | 3,027 | | 1994 | 2,847 | | 1993 | 2,680 | | 1992 | 2,529 | | 1991 | 2,396 | | 1990 | 2,378 | | 1989 | 2,455 | | 1988 | 2,492 | | 1987 | 2,462 | | 1986 | 2,371 | | 1985 | 2,233 | | 1984 | 2,067 | | 1983 | 1,892 | | 1982 | 1,725 | | 1981 | 1,580 | | 1980 | 1,578 | | 1979 | 1,776 | | 1978 | 2,076 | | 1977 | 2,408 | | 1976 | 2,721 | | 1975 | 2,964 | | 1974 | 3,056 | | 1973 | 2,996 | | 1972 | 2,869 | | 1971 | 2,715 | | 1970 | 2,561 | | 1969 | 2,399 | | 1968 | 2,211 | | 1967 | 2,023 | | 1966 | 1,879 | | 1965 | 1,806 | | 1964 | 1,810 | | 1963 | 1,908 | | 1962 | 2,081 | | 1961 | 2,249 | | 1960 | 2,363 |
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