| Year | Value | | 2022 | 3,682 | | 2021 | 3,722 | | 2020 | 3,770 | | 2019 | 3,821 | | 2018 | 3,862 | | 2017 | 3,890 | | 2016 | 3,898 | | 2015 | 3,871 | | 2014 | 3,799 | | 2013 | 3,697 | | 2012 | 3,588 | | 2011 | 3,494 | | 2010 | 3,434 | | 2009 | 3,445 | | 2008 | 3,528 | | 2007 | 3,637 | | 2006 | 3,746 | | 2005 | 3,824 | | 2004 | 3,830 | | 2003 | 3,770 | | 2002 | 3,670 | | 2001 | 3,535 | | 2000 | 3,377 | | 1999 | 3,228 | | 1998 | 3,091 | | 1997 | 2,955 | | 1996 | 2,849 | | 1995 | 2,755 | | 1994 | 2,616 | | 1993 | 2,468 | | 1992 | 2,338 | | 1991 | 2,200 | | 1990 | 2,080 | | 1989 | 1,943 | | 1988 | 1,853 | | 1987 | 1,747 | | 1986 | 1,662 | | 1985 | 1,588 | | 1984 | 1,521 | | 1983 | 1,491 | | 1982 | 1,474 | | 1981 | 1,461 | | 1980 | 1,467 | | 1979 | 1,422 | | 1978 | 1,416 | | 1977 | 1,394 | | 1976 | 1,448 | | 1975 | 1,410 | | 1974 | 1,332 | | 1973 | 1,239 | | 1972 | 1,116 | | 1971 | 1,025 | | 1970 | 910 | | 1969 | 874 | | 1968 | 821 | | 1967 | 728 | | 1966 | 684 | | 1965 | 643 | | 1964 | 601 | | 1963 | 586 | | 1962 | 526 | | 1961 | 536 | | 1960 | 513 |
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