| Year | Value | | 2022 | 10,035 | | 2021 | 10,172 | | 2020 | 10,264 | | 2019 | 10,244 | | 2018 | 10,135 | | 2017 | 9,937 | | 2016 | 9,636 | | 2015 | 9,249 | | 2014 | 8,790 | | 2013 | 8,255 | | 2012 | 7,679 | | 2011 | 7,104 | | 2010 | 6,501 | | 2009 | 5,855 | | 2008 | 5,277 | | 2007 | 4,895 | | 2006 | 4,754 | | 2005 | 4,821 | | 2004 | 4,956 | | 2003 | 4,964 | | 2002 | 4,808 | | 2001 | 4,560 | | 2000 | 4,276 | | 1999 | 4,009 | | 1998 | 3,756 | | 1997 | 3,511 | | 1996 | 3,279 | | 1995 | 3,062 | | 1994 | 2,861 | | 1993 | 2,677 | | 1992 | 2,519 | | 1991 | 2,384 | | 1990 | 2,329 | | 1989 | 2,351 | | 1988 | 2,387 | | 1987 | 2,405 | | 1986 | 2,384 | | 1985 | 2,327 | | 1984 | 2,243 | | 1983 | 2,147 | | 1982 | 2,054 | | 1981 | 1,979 | | 1980 | 1,951 | | 1979 | 1,994 | | 1978 | 2,070 | | 1977 | 2,124 | | 1976 | 2,143 | | 1975 | 2,137 | | 1974 | 2,093 | | 1973 | 2,008 | | 1972 | 1,908 | | 1971 | 1,806 | | 1970 | 1,704 | | 1969 | 1,600 | | 1968 | 1,490 | | 1967 | 1,386 | | 1966 | 1,310 | | 1965 | 1,276 | | 1964 | 1,291 | | 1963 | 1,367 | | 1962 | 1,491 | | 1961 | 1,615 | | 1960 | 1,708 |
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