| Year | Value | | 2022 | 1,926 | | 2021 | 1,921 | | 2020 | 1,919 | | 2019 | 1,906 | | 2018 | 1,886 | | 2017 | 1,850 | | 2016 | 1,806 | | 2015 | 1,758 | | 2014 | 1,712 | | 2013 | 1,674 | | 2012 | 1,645 | | 2011 | 1,625 | | 2010 | 1,614 | | 2009 | 1,619 | | 2008 | 1,637 | | 2007 | 1,666 | | 2006 | 1,707 | | 2005 | 1,748 | | 2004 | 1,762 | | 2003 | 1,747 | | 2002 | 1,703 | | 2001 | 1,630 | | 2000 | 1,541 | | 1999 | 1,452 | | 1998 | 1,373 | | 1997 | 1,301 | | 1996 | 1,236 | | 1995 | 1,181 | | 1994 | 1,139 | | 1993 | 1,107 | | 1992 | 1,084 | | 1991 | 1,068 | | 1990 | 1,050 | | 1989 | 1,025 | | 1988 | 994 | | 1987 | 961 | | 1986 | 925 | | 1985 | 886 | | 1984 | 846 | | 1983 | 807 | | 1982 | 769 | | 1981 | 735 | | 1980 | 706 | | 1979 | 682 | | 1978 | 659 | | 1977 | 640 | | 1976 | 622 | | 1975 | 605 | | 1974 | 587 | | 1973 | 570 | | 1972 | 552 | | 1971 | 537 | | 1970 | 524 | | 1969 | 509 | | 1968 | 495 | | 1967 | 482 | | 1966 | 467 | | 1965 | 450 | | 1964 | 436 | | 1963 | 421 | | 1962 | 405 | | 1961 | 392 | | 1960 | 378 |
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