| Year | Value | | 2022 | 3,252 | | 2021 | 3,148 | | 2020 | 3,097 | | 2019 | 3,081 | | 2018 | 3,065 | | 2017 | 3,042 | | 2016 | 2,997 | | 2015 | 2,909 | | 2014 | 2,765 | | 2013 | 2,578 | | 2012 | 2,365 | | 2011 | 2,152 | | 2010 | 1,971 | | 2009 | 1,861 | | 2008 | 1,823 | | 2007 | 1,826 | | 2006 | 1,839 | | 2005 | 1,834 | | 2004 | 1,805 | | 2003 | 1,755 | | 2002 | 1,699 | | 2001 | 1,648 | | 2000 | 1,605 | | 1999 | 1,575 | | 1998 | 1,568 | | 1997 | 1,583 | | 1996 | 1,610 | | 1995 | 1,638 | | 1994 | 1,650 | | 1993 | 1,626 | | 1992 | 1,553 | | 1991 | 1,436 | | 1990 | 1,300 | | 1989 | 1,162 | | 1988 | 1,051 | | 1987 | 970 | | 1986 | 904 | | 1985 | 848 | | 1984 | 795 | | 1983 | 761 | | 1982 | 743 | | 1981 | 728 | | 1980 | 712 | | 1979 | 688 | | 1978 | 653 | | 1977 | 607 | | 1976 | 558 | | 1975 | 506 | | 1974 | 455 | | 1973 | 413 | | 1972 | 378 | | 1971 | 346 | | 1970 | 323 | | 1969 | 323 | | 1968 | 335 | | 1967 | 341 | | 1966 | 337 | | 1965 | 329 | | 1964 | 320 | | 1963 | 310 | | 1962 | 298 | | 1961 | 289 | | 1960 | 278 |
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