| Year | Value | | 2022 | 4,289 | | 2021 | 4,142 | | 2020 | 3,966 | | 2019 | 3,803 | | 2018 | 3,639 | | 2017 | 3,461 | | 2016 | 3,301 | | 2015 | 3,159 | | 2014 | 3,017 | | 2013 | 2,909 | | 2012 | 2,847 | | 2011 | 2,807 | | 2010 | 2,790 | | 2009 | 2,806 | | 2008 | 2,862 | | 2007 | 2,943 | | 2006 | 3,030 | | 2005 | 3,104 | | 2004 | 3,143 | | 2003 | 3,124 | | 2002 | 3,049 | | 2001 | 2,948 | | 2000 | 2,838 | | 1999 | 2,723 | | 1998 | 2,613 | | 1997 | 2,511 | | 1996 | 2,407 | | 1995 | 2,307 | | 1994 | 2,220 | | 1993 | 2,143 | | 1992 | 2,081 | | 1991 | 2,033 | | 1990 | 2,004 | | 1989 | 1,977 | | 1988 | 1,937 | | 1987 | 1,891 | | 1986 | 1,838 | | 1985 | 1,772 | | 1984 | 1,704 | | 1983 | 1,650 | | 1982 | 1,611 | | 1981 | 1,581 | | 1980 | 1,554 | | 1979 | 1,530 | | 1978 | 1,496 | | 1977 | 1,457 | | 1976 | 1,432 | | 1975 | 1,423 | | 1974 | 1,429 | | 1973 | 1,425 | | 1972 | 1,419 | | 1971 | 1,427 | | 1970 | 1,437 | | 1969 | 1,438 | | 1968 | 1,429 | | 1967 | 1,423 | | 1966 | 1,426 | | 1965 | 1,420 | | 1964 | 1,401 | | 1963 | 1,374 | | 1962 | 1,341 | | 1961 | 1,303 | | 1960 | 1,261 |
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