| Year | Value | | 2022 | 1,643 | | 2021 | 1,644 | | 2020 | 1,619 | | 2019 | 1,573 | | 2018 | 1,532 | | 2017 | 1,488 | | 2016 | 1,445 | | 2015 | 1,403 | | 2014 | 1,359 | | 2013 | 1,303 | | 2012 | 1,239 | | 2011 | 1,176 | | 2010 | 1,110 | | 2009 | 1,042 | | 2008 | 977 | | 2007 | 918 | | 2006 | 861 | | 2005 | 808 | | 2004 | 764 | | 2003 | 733 | | 2002 | 714 | | 2001 | 699 | | 2000 | 685 | | 1999 | 673 | | 1998 | 671 | | 1997 | 680 | | 1996 | 694 | | 1995 | 709 | | 1994 | 726 | | 1993 | 738 | | 1992 | 739 | | 1991 | 730 | | 1990 | 709 | | 1989 | 682 | | 1988 | 659 | | 1987 | 637 | | 1986 | 614 | | 1985 | 591 | | 1984 | 574 | | 1983 | 559 | | 1982 | 540 | | 1981 | 520 | | 1980 | 500 | | 1979 | 481 | | 1978 | 462 | | 1977 | 444 | | 1976 | 428 | | 1975 | 413 | | 1974 | 401 | | 1973 | 390 | | 1972 | 375 | | 1971 | 359 | | 1970 | 345 | | 1969 | 334 | | 1968 | 322 | | 1967 | 310 | | 1966 | 299 | | 1965 | 286 | | 1964 | 272 | | 1963 | 256 | | 1962 | 239 | | 1961 | 223 | | 1960 | 206 |
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