| Year | Value | | 2022 | 3,870 | | 2021 | 3,704 | | 2020 | 3,594 | | 2019 | 3,499 | | 2018 | 3,397 | | 2017 | 3,292 | | 2016 | 3,197 | | 2015 | 3,098 | | 2014 | 2,996 | | 2013 | 2,896 | | 2012 | 2,796 | | 2011 | 2,687 | | 2010 | 2,568 | | 2009 | 2,435 | | 2008 | 2,295 | | 2007 | 2,162 | | 2006 | 2,021 | | 2005 | 1,865 | | 2004 | 1,720 | | 2003 | 1,594 | | 2002 | 1,498 | | 2001 | 1,439 | | 2000 | 1,403 | | 1999 | 1,371 | | 1998 | 1,332 | | 1997 | 1,278 | | 1996 | 1,194 | | 1995 | 1,083 | | 1994 | 974 | | 1993 | 881 | | 1992 | 813 | | 1991 | 786 | | 1990 | 797 | | 1989 | 823 | | 1988 | 851 | | 1987 | 872 | | 1986 | 866 | | 1985 | 831 | | 1984 | 785 | | 1983 | 732 | | 1982 | 675 | | 1981 | 631 | | 1980 | 602 | | 1979 | 580 | | 1978 | 555 | | 1977 | 529 | | 1976 | 498 | | 1975 | 459 | | 1974 | 415 | | 1973 | 370 | | 1972 | 329 | | 1971 | 307 | | 1970 | 306 | | 1969 | 311 | | 1968 | 320 | | 1967 | 329 | | 1966 | 330 | | 1965 | 320 | | 1964 | 304 | | 1963 | 283 | | 1962 | 257 | | 1961 | 240 | | 1960 | 235 |
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