Year | Value | 2021 | 494.1 | 2020 | 494.1 | 2019 | 494.1 | 2018 | 551.7 | 2017 | 620 | 2016 | 688.1 | 2015 | 756.2 | 2014 | 675 | 2013 | 610 | 2012 | 545 | 2011 | 480 | 2010 | 415 | 2009 | 349 | 2008 | 370 | 2007 | 385 | 2006 | 402 | 2005 | 420 | 2004 | 430 | 2003 | 450 | 2002 | 470 | 2001 | 480 | 2000 | 480 | 1999 | 508 | 1998 | 510 | 1997 | 510 | 1996 | 510 | 1995 | 510 | 1994 | 510 | 1993 | 520 | 1992 | 520 | 1991 | 540 | 1990 | 540 | 1989 | 542 | 1988 | 770 | 1987 | 767 | 1986 | 784 | 1985 | 780 | 1984 | 780 | 1983 | 776 | 1982 | 770 | 1981 | 770 | 1980 | 740 | 1979 | 735 | 1978 | 710 | 1977 | 710 | 1976 | 690 | 1975 | 650 | 1974 | 640 | 1973 | 640 | 1972 | 640 | 1971 | 640 | 1970 | 635 | 1969 | 630 | 1968 | 630 | 1967 | 620 | 1966 | 620 | 1965 | 620 | 1964 | 570 | 1963 | 570 | 1962 | 570 | 1961 | 560 |
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