| Year | Value | | 2022 | 2,683 | | 2021 | 2,605 | | 2020 | 2,541 | | 2019 | 2,408 | | 2018 | 2,426 | | 2017 | 2,503 | | 2016 | 2,383 | | 2015 | 2,248 | | 2014 | 2,117 | | 2013 | 1,998 | | 2012 | 1,898 | | 2011 | 1,819 | | 2010 | 1,740 | | 2009 | 1,677 | | 2008 | 1,637 | | 2007 | 1,595 | | 2006 | 1,545 | | 2005 | 1,489 | | 2004 | 1,436 | | 2003 | 1,398 | | 2002 | 1,352 | | 2001 | 1,323 | | 2000 | 1,328 | | 1999 | 1,332 | | 1998 | 1,331 | | 1997 | 1,313 | | 1996 | 1,279 | | 1995 | 1,250 | | 1994 | 1,228 | | 1993 | 1,208 | | 1992 | 1,184 | | 1991 | 1,155 | | 1990 | 1,123 | | 1989 | 1,093 | | 1988 | 1,063 | | 1987 | 1,034 | | 1986 | 1,008 | | 1985 | 985 | | 1984 | 962 | | 1983 | 944 | | 1982 | 925 | | 1981 | 896 | | 1980 | 869 | | 1979 | 845 | | 1978 | 821 | | 1977 | 800 | | 1976 | 777 | | 1975 | 752 | | 1974 | 731 | | 1973 | 712 | | 1972 | 708 | | 1971 | 702 | | 1970 | 691 | | 1969 | 686 | | 1968 | 683 | | 1967 | 682 | | 1966 | 687 | | 1965 | 695 | | 1964 | 702 | | 1963 | 709 | | 1962 | 714 | | 1961 | 717 | | 1960 | 718 |
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