| Year | Value | | 2022 | 3,599 | | 2021 | 3,624 | | 2020 | 3,631 | | 2019 | 3,593 | | 2018 | 3,514 | | 2017 | 3,435 | | 2016 | 3,372 | | 2015 | 3,333 | | 2014 | 3,335 | | 2013 | 3,380 | | 2012 | 3,445 | | 2011 | 3,509 | | 2010 | 3,555 | | 2009 | 3,584 | | 2008 | 3,575 | | 2007 | 3,513 | | 2006 | 3,407 | | 2005 | 3,265 | | 2004 | 3,088 | | 2003 | 2,890 | | 2002 | 2,692 | | 2001 | 2,506 | | 2000 | 2,348 | | 1999 | 2,237 | | 1998 | 2,165 | | 1997 | 2,098 | | 1996 | 2,031 | | 1995 | 1,974 | | 1994 | 1,921 | | 1993 | 1,853 | | 1992 | 1,774 | | 1991 | 1,705 | | 1990 | 1,627 | | 1989 | 1,504 | | 1988 | 1,444 | | 1987 | 1,389 | | 1986 | 1,337 | | 1985 | 1,305 | | 1984 | 1,275 | | 1983 | 1,248 | | 1982 | 1,258 | | 1981 | 1,270 | | 1980 | 1,250 | | 1979 | 1,195 | | 1978 | 1,176 | | 1977 | 1,113 | | 1976 | 1,124 | | 1975 | 1,081 | | 1974 | 1,002 | | 1973 | 903 | | 1972 | 786 | | 1971 | 702 | | 1970 | 614 | | 1969 | 584 | | 1968 | 544 | | 1967 | 491 | | 1966 | 484 | | 1965 | 486 | | 1964 | 486 | | 1963 | 502 | | 1962 | 466 | | 1961 | 483 | | 1960 | 433 |
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