| Year | Value | | 2022 | 4,083 | | 2021 | 4,118 | | 2020 | 4,172 | | 2019 | 4,236 | | 2018 | 4,302 | | 2017 | 4,372 | | 2016 | 4,439 | | 2015 | 4,509 | | 2014 | 4,587 | | 2013 | 4,672 | | 2012 | 4,757 | | 2011 | 4,829 | | 2010 | 4,872 | | 2009 | 4,858 | | 2008 | 4,793 | | 2007 | 4,698 | | 2006 | 4,583 | | 2005 | 4,438 | | 2004 | 4,296 | | 2003 | 4,145 | | 2002 | 3,969 | | 2001 | 3,799 | | 2000 | 3,617 | | 1999 | 3,422 | | 1998 | 3,246 | | 1997 | 3,098 | | 1996 | 2,963 | | 1995 | 2,841 | | 1994 | 2,707 | | 1993 | 2,549 | | 1992 | 2,378 | | 1991 | 2,197 | | 1990 | 2,046 | | 1989 | 1,956 | | 1988 | 1,921 | | 1987 | 1,936 | | 1986 | 1,969 | | 1985 | 1,982 | | 1984 | 1,965 | | 1983 | 1,937 | | 1982 | 1,896 | | 1981 | 1,819 | | 1980 | 1,723 | | 1979 | 1,633 | | 1978 | 1,540 | | 1977 | 1,443 | | 1976 | 1,350 | | 1975 | 1,272 | | 1974 | 1,211 | | 1973 | 1,155 | | 1972 | 1,119 | | 1971 | 1,116 | | 1970 | 1,128 | | 1969 | 1,142 | | 1968 | 1,159 | | 1967 | 1,185 | | 1966 | 1,222 | | 1965 | 1,261 | | 1964 | 1,304 | | 1963 | 1,338 | | 1962 | 1,354 | | 1961 | 1,358 | | 1960 | 1,351 |
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