Year | Value | 2021 | 1,200 | 2020 | 1,200 | 2019 | 1,200 | 2018 | 1,200 | 2017 | 1,200 | 2016 | 1,170 | 2015 | 1,160 | 2014 | 1,145 | 2013 | 1,130 | 2012 | 1,130 | 2011 | 1,110 | 2010 | 1,080 | 2009 | 1,020 | 2008 | 990 | 2007 | 960 | 2006 | 950 | 2005 | 910 | 2004 | 840 | 2003 | 830 | 2002 | 790 | 2001 | 770 | 2000 | 760 | 1999 | 760 | 1998 | 740 | 1997 | 730 | 1996 | 730 | 1995 | 730 | 1994 | 720 | 1993 | 710 | 1992 | 710 | 1991 | 690 | 1990 | 680 | 1989 | 680 | 1988 | 670 | 1987 | 650 | 1986 | 660 | 1985 | 640 | 1984 | 640 | 1983 | 620 | 1982 | 620 | 1981 | 590 | 1980 | 590 | 1979 | 590 | 1978 | 570 | 1977 | 560 | 1976 | 550 | 1975 | 550 | 1974 | 550 | 1973 | 550 | 1972 | 550 | 1971 | 550 | 1970 | 550 | 1969 | 550 | 1968 | 550 | 1967 | 550 | 1966 | 550 | 1965 | 550 | 1964 | 550 | 1963 | 550 | 1962 | 550 | 1961 | 550 |
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