| Year | Value | | 2022 | 4,146 | | 2021 | 4,021 | | 2020 | 3,963 | | 2019 | 3,918 | | 2018 | 3,913 | | 2017 | 3,955 | | 2016 | 4,051 | | 2015 | 4,212 | | 2014 | 4,169 | | 2013 | 3,926 | | 2012 | 3,762 | | 2011 | 3,679 | | 2010 | 3,613 | | 2009 | 3,455 | | 2008 | 3,219 | | 2007 | 2,965 | | 2006 | 2,713 | | 2005 | 2,481 | | 2004 | 2,233 | | 2003 | 1,941 | | 2002 | 1,664 | | 2001 | 1,435 | | 2000 | 1,254 | | 1999 | 1,121 | | 1998 | 1,023 | | 1997 | 951 | | 1996 | 902 | | 1995 | 867 | | 1994 | 845 | | 1993 | 832 | | 1992 | 831 | | 1991 | 835 | | 1990 | 803 | | 1989 | 728 | | 1988 | 666 | | 1987 | 627 | | 1986 | 603 | | 1985 | 592 | | 1984 | 590 | | 1983 | 591 | | 1982 | 595 | | 1981 | 602 | | 1980 | 569 | | 1979 | 500 | | 1978 | 444 | | 1977 | 406 | | 1976 | 384 | | 1975 | 378 | | 1974 | 386 | | 1973 | 399 | | 1972 | 414 | | 1971 | 431 | | 1970 | 443 | | 1969 | 449 | | 1968 | 447 | | 1967 | 432 | | 1966 | 418 | | 1965 | 409 | | 1964 | 399 | | 1963 | 393 | | 1962 | 388 | | 1961 | 383 | | 1960 | 379 |
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