| Year | Value | | 2022 | 5,250 | | 2021 | 4,454 | | 2020 | 4,473 | | 2019 | 4,466 | | 2018 | 4,441 | | 2017 | 4,436 | | 2016 | 4,418 | | 2015 | 4,370 | | 2014 | 4,279 | | 2013 | 4,200 | | 2012 | 4,076 | | 2011 | 4,019 | | 2010 | 4,172 | | 2009 | 4,104 | | 2008 | 4,161 | | 2007 | 4,168 | | 2006 | 4,173 | | 2005 | 4,087 | | 2004 | 4,078 | | 2003 | 4,034 | | 2002 | 4,006 | | 2001 | 3,836 | | 2000 | 3,717 | | 1999 | 3,551 | | 1998 | 3,420 | | 1997 | 3,315 | | 1996 | 3,269 | | 1995 | 3,270 | | 1994 | 3,284 | | 1993 | 3,244 | | 1992 | 3,200 | | 1991 | 3,195 | | 1990 | 3,153 | | 1989 | 3,128 | | 1988 | 3,088 | | 1987 | 3,060 | | 1986 | 2,915 | | 1985 | 2,848 | | 1984 | 2,747 | | 1983 | 2,636 | | 1982 | 2,535 | | 1981 | 2,428 | | 1980 | 2,330 | | 1979 | 2,251 | | 1978 | 2,178 | | 1977 | 2,096 | | 1976 | 1,979 | | 1975 | 1,886 | | 1974 | 1,805 | | 1973 | 1,741 | | 1972 | 1,685 | | 1971 | 1,616 | | 1970 | 1,574 | | 1969 | 1,550 | | 1968 | 1,534 | | 1967 | 1,525 | | 1966 | 1,519 | | 1965 | 1,512 | | 1964 | 1,505 | | 1963 | 1,495 | | 1962 | 1,477 | | 1961 | 1,453 | | 1960 | 1,424 |
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