| Year | Value | | 2022 | 2,224 | | 2021 | 2,173 | | 2020 | 2,118 | | 2019 | 2,062 | | 2018 | 2,010 | | 2017 | 1,961 | | 2016 | 1,915 | | 2015 | 1,875 | | 2014 | 1,834 | | 2013 | 1,792 | | 2012 | 1,753 | | 2011 | 1,717 | | 2010 | 1,684 | | 2009 | 1,655 | | 2008 | 1,629 | | 2007 | 1,604 | | 2006 | 1,579 | | 2005 | 1,554 | | 2004 | 1,527 | | 2003 | 1,499 | | 2002 | 1,470 | | 2001 | 1,442 | | 2000 | 1,414 | | 1999 | 1,374 | | 1998 | 1,323 | | 1997 | 1,281 | | 1996 | 1,241 | | 1995 | 1,205 | | 1994 | 1,173 | | 1993 | 1,144 | | 1992 | 1,115 | | 1991 | 1,089 | | 1990 | 1,069 | | 1989 | 1,048 | | 1988 | 1,027 | | 1987 | 1,012 | | 1986 | 997 | | 1985 | 973 | | 1984 | 946 | | 1983 | 922 | | 1982 | 903 | | 1981 | 887 | | 1980 | 875 | | 1979 | 866 | | 1978 | 858 | | 1977 | 855 | | 1976 | 860 | | 1975 | 859 | | 1974 | 837 | | 1973 | 803 | | 1972 | 765 | | 1971 | 725 | | 1970 | 678 | | 1969 | 633 | | 1968 | 606 | | 1967 | 585 | | 1966 | 565 | | 1965 | 543 | | 1964 | 520 | | 1963 | 495 | | 1962 | 469 | | 1961 | 443 | | 1960 | 413 |
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