| Year | Value | | 2022 | 3,466 | | 2021 | 3,498 | | 2020 | 3,554 | | 2019 | 3,630 | | 2018 | 3,718 | | 2017 | 3,791 | | 2016 | 3,813 | | 2015 | 3,806 | | 2014 | 3,780 | | 2013 | 3,728 | | 2012 | 3,656 | | 2011 | 3,554 | | 2010 | 3,431 | | 2009 | 3,319 | | 2008 | 3,214 | | 2007 | 3,091 | | 2006 | 2,957 | | 2005 | 2,812 | | 2004 | 2,650 | | 2003 | 2,489 | | 2002 | 2,357 | | 2001 | 2,266 | | 2000 | 2,184 | | 1999 | 2,084 | | 1998 | 1,985 | | 1997 | 1,891 | | 1996 | 1,787 | | 1995 | 1,698 | | 1994 | 1,618 | | 1993 | 1,525 | | 1992 | 1,430 | | 1991 | 1,343 | | 1990 | 1,263 | | 1989 | 1,200 | | 1988 | 1,168 | | 1987 | 1,165 | | 1986 | 1,190 | | 1985 | 1,233 | | 1984 | 1,292 | | 1983 | 1,342 | | 1982 | 1,374 | | 1981 | 1,404 | | 1980 | 1,429 | | 1979 | 1,447 | | 1978 | 1,459 | | 1977 | 1,464 | | 1976 | 1,461 | | 1975 | 1,456 | | 1974 | 1,450 | | 1973 | 1,445 | | 1972 | 1,440 | | 1971 | 1,437 | | 1970 | 1,434 | | 1969 | 1,420 | | 1968 | 1,404 | | 1967 | 1,395 | | 1966 | 1,388 | | 1965 | 1,377 | | 1964 | 1,356 | | 1963 | 1,323 | | 1962 | 1,284 | | 1961 | 1,250 | | 1960 | 1,231 |
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