| Year | Value | | 2022 | 4,239 | | 2021 | 4,218 | | 2020 | 4,194 | | 2019 | 4,166 | | 2018 | 4,152 | | 2017 | 4,156 | | 2016 | 4,129 | | 2015 | 4,057 | | 2014 | 3,979 | | 2013 | 3,887 | | 2012 | 3,779 | | 2011 | 3,660 | | 2010 | 3,530 | | 2009 | 3,391 | | 2008 | 3,256 | | 2007 | 3,127 | | 2006 | 3,010 | | 2005 | 2,889 | | 2004 | 2,718 | | 2003 | 2,507 | | 2002 | 2,294 | | 2001 | 2,086 | | 2000 | 1,882 | | 1999 | 1,687 | | 1998 | 1,552 | | 1997 | 1,471 | | 1996 | 1,399 | | 1995 | 1,332 | | 1994 | 1,276 | | 1993 | 1,241 | | 1992 | 1,266 | | 1991 | 1,285 | | 1990 | 1,236 | | 1989 | 1,179 | | 1988 | 1,123 | | 1987 | 1,069 | | 1986 | 1,018 | | 1985 | 969 | | 1984 | 923 | | 1983 | 881 | | 1982 | 841 | | 1981 | 804 | | 1980 | 769 | | 1979 | 735 | | 1978 | 703 | | 1977 | 673 | | 1976 | 646 | | 1975 | 618 | | 1974 | 592 | | 1973 | 568 | | 1972 | 546 | | 1971 | 525 | | 1970 | 506 | | 1969 | 486 | | 1968 | 466 | | 1967 | 447 | | 1966 | 431 | | 1965 | 416 | | 1964 | 403 | | 1963 | 393 | | 1962 | 384 | | 1961 | 377 | | 1960 | 371 |
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