| Year | Value | | 2022 | 4,958 | | 2021 | 4,860 | | 2020 | 4,765 | | 2019 | 4,674 | | 2018 | 4,582 | | 2017 | 4,485 | | 2016 | 4,383 | | 2015 | 4,284 | | 2014 | 4,185 | | 2013 | 4,081 | | 2012 | 3,972 | | 2011 | 3,874 | | 2010 | 3,780 | | 2009 | 3,681 | | 2008 | 3,583 | | 2007 | 3,489 | | 2006 | 3,365 | | 2005 | 3,210 | | 2004 | 3,060 | | 2003 | 2,918 | | 2002 | 2,783 | | 2001 | 2,680 | | 2000 | 2,613 | | 1999 | 2,560 | | 1998 | 2,522 | | 1997 | 2,501 | | 1996 | 2,492 | | 1995 | 2,488 | | 1994 | 2,491 | | 1993 | 2,494 | | 1992 | 2,498 | | 1991 | 2,512 | | 1990 | 2,531 | | 1989 | 2,541 | | 1988 | 2,555 | | 1987 | 2,574 | | 1986 | 2,566 | | 1985 | 2,532 | | 1984 | 2,508 | | 1983 | 2,511 | | 1982 | 2,536 | | 1981 | 2,552 | | 1980 | 2,541 | | 1979 | 2,508 | | 1978 | 2,460 | | 1977 | 2,402 | | 1976 | 2,309 | | 1975 | 2,188 | | 1974 | 2,083 | | 1973 | 2,019 | | 1972 | 1,976 | | 1971 | 1,926 | | 1970 | 1,861 | | 1969 | 1,782 | | 1968 | 1,699 | | 1967 | 1,618 | | 1966 | 1,556 | | 1965 | 1,513 | | 1964 | 1,471 | | 1963 | 1,430 | | 1962 | 1,392 | | 1961 | 1,359 | | 1960 | 1,330 |
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