| Year | Value | | 2021 | 4,346.39907 | | 2020 | 4,145.02216 | | 2019 | 5,656.442 | | 2018 | 5,886.5149036518 | | 2017 | 5,855.480475616 | | 2016 | 4,745.958515461 | | 2015 | 5,292.794684592 | | 2014 | 5,726.179652 | | 2013 | 5,753.728484 | | 2012 | 6,014.588547496 | | 2011 | 6,347.2531603208 | | 2010 | 6,444.381618449 | | 2009 | 4,520.328 | | 2008 | 4,903.379 | | 2007 | 5,005.596 | | 2006 | 4,959.004 | | 2005 | 4,893.971 | | 2004 | 4,780.432 | | 2003 | 4,330.731 | | 2002 | 4,203.584 | | 2001 | 4,115.852 | | 2000 | 4,367.344 | | 1999 | 4,053 | | 1998 | 3,833.3999023438 | | 1997 | 3,893.1000976563 | | 1996 | 3,902.3999023438 | | 1995 | 3,742.1999511719 | | 1994 | 3,203.8000488281 | | 1993 | 2,770.6999511719 | | 1992 | 2,396.8999023438 | | 1991 | 2,224.3000488281 | | 1990 | 2,129.1000976563 | | 1989 | 2,002.9000244141 | | 1988 | 1,881.8000488281 | | 1987 | 1,734.3000488281 | | 1986 | 1,509.4000244141 | | 1985 | 1,403.9000244141 | | 1984 | 1,392.5 | | 1983 | 1,193.6999511719 | | 1982 | 1,032.5 | | 1981 | 1,046.4000244141 | | 1980 | 947.0999755859 | | 1979 | 869.5 | | 1978 | 786.9000244141 | | 1977 | 719.4000244141 | | 1976 | 631.9000244141 | | 1975 | 586.700012207 | | 1974 | 609 | | 1973 | 498.5 | | 1972 | 461 | | 1971 | 408.3999938965 | | 1970 | 376.8999938965 |
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