| Year | Value | | 2022 | 12,396 | | 2021 | 12,347 | | 2020 | 12,280 | | 2019 | 12,179 | | 2018 | 12,037 | | 2017 | 11,845 | | 2016 | 11,610 | | 2015 | 11,346 | | 2014 | 11,065 | | 2013 | 10,764 | | 2012 | 10,448 | | 2011 | 10,135 | | 2010 | 9,831 | | 2009 | 9,496 | | 2008 | 9,186 | | 2007 | 8,964 | | 2006 | 8,772 | | 2005 | 8,591 | | 2004 | 8,416 | | 2003 | 8,184 | | 2002 | 7,881 | | 2001 | 7,561 | | 2000 | 7,246 | | 1999 | 6,950 | | 1998 | 6,677 | | 1997 | 6,426 | | 1996 | 6,194 | | 1995 | 5,979 | | 1994 | 5,785 | | 1993 | 5,611 | | 1992 | 5,451 | | 1991 | 5,311 | | 1990 | 5,192 | | 1989 | 5,120 | | 1988 | 5,087 | | 1987 | 5,054 | | 1986 | 5,015 | | 1985 | 4,970 | | 1984 | 4,920 | | 1983 | 4,864 | | 1982 | 4,802 | | 1981 | 4,734 | | 1980 | 4,654 | | 1979 | 4,463 | | 1978 | 4,225 | | 1977 | 4,053 | | 1976 | 3,898 | | 1975 | 3,753 | | 1974 | 3,624 | | 1973 | 3,493 | | 1972 | 3,373 | | 1971 | 3,287 | | 1970 | 3,217 | | 1969 | 3,156 | | 1968 | 3,100 | | 1967 | 3,042 | | 1966 | 2,977 | | 1965 | 2,908 | | 1964 | 2,836 | | 1963 | 2,762 | | 1962 | 2,689 | | 1961 | 2,618 | | 1960 | 2,550 |
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