| Year | Value | | 2022 | 1,614 | | 2021 | 1,585 | | 2020 | 1,569 | | 2019 | 1,510 | | 2018 | 1,544 | | 2017 | 1,615 | | 2016 | 1,563 | | 2015 | 1,500 | | 2014 | 1,440 | | 2013 | 1,389 | | 2012 | 1,343 | | 2011 | 1,298 | | 2010 | 1,246 | | 2009 | 1,199 | | 2008 | 1,164 | | 2007 | 1,128 | | 2006 | 1,090 | | 2005 | 1,046 | | 2004 | 1,002 | | 2003 | 970 | | 2002 | 935 | | 2001 | 917 | | 2000 | 926 | | 1999 | 932 | | 1998 | 931 | | 1997 | 909 | | 1996 | 865 | | 1995 | 819 | | 1994 | 780 | | 1993 | 749 | | 1992 | 734 | | 1991 | 740 | | 1990 | 761 | | 1989 | 795 | | 1988 | 834 | | 1987 | 867 | | 1986 | 884 | | 1985 | 879 | | 1984 | 856 | | 1983 | 825 | | 1982 | 785 | | 1981 | 738 | | 1980 | 696 | | 1979 | 656 | | 1978 | 620 | | 1977 | 591 | | 1976 | 562 | | 1975 | 536 | | 1974 | 512 | | 1973 | 489 | | 1972 | 477 | | 1971 | 463 | | 1970 | 438 | | 1969 | 416 | | 1968 | 393 | | 1967 | 370 | | 1966 | 354 | | 1965 | 343 | | 1964 | 335 | | 1963 | 334 | | 1962 | 337 | | 1961 | 343 | | 1960 | 353 |
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