| Year | Value | | 2022 | 15,455 | | 2021 | 15,593 | | 2020 | 15,774 | | 2019 | 15,807 | | 2018 | 15,579 | | 2017 | 15,275 | | 2016 | 14,930 | | 2015 | 14,529 | | 2014 | 14,281 | | 2013 | 14,204 | | 2012 | 14,092 | | 2011 | 13,913 | | 2010 | 13,680 | | 2009 | 13,389 | | 2008 | 12,998 | | 2007 | 12,489 | | 2006 | 11,930 | | 2005 | 11,381 | | 2004 | 10,836 | | 2003 | 10,296 | | 2002 | 9,740 | | 2001 | 9,175 | | 2000 | 8,625 | | 1999 | 8,102 | | 1998 | 7,684 | | 1997 | 7,350 | | 1996 | 7,055 | | 1995 | 6,739 | | 1994 | 6,449 | | 1993 | 6,243 | | 1992 | 6,099 | | 1991 | 6,026 | | 1990 | 6,020 | | 1989 | 6,010 | | 1988 | 5,911 | | 1987 | 5,760 | | 1986 | 5,599 | | 1985 | 5,450 | | 1984 | 5,297 | | 1983 | 5,146 | | 1982 | 5,020 | | 1981 | 4,909 | | 1980 | 4,776 | | 1979 | 4,618 | | 1978 | 4,462 | | 1977 | 4,301 | | 1976 | 4,127 | | 1975 | 3,950 | | 1974 | 3,787 | | 1973 | 3,646 | | 1972 | 3,529 | | 1971 | 3,446 | | 1970 | 3,394 | | 1969 | 3,348 | | 1968 | 3,292 | | 1967 | 3,230 | | 1966 | 3,161 | | 1965 | 3,094 | | 1964 | 3,039 | | 1963 | 2,986 | | 1962 | 2,921 | | 1961 | 2,844 | | 1960 | 2,754 |
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