| Year | Value | | 2021 | 5,466.8909949799 | | 2020 | 4,741.6782076196 | | 2019 | 4,999.3936829664 | | 2018 | 4,934.9356958054 | | 2017 | 4,763.726897892 | | 2016 | 4,350.9886538336 | | 2015 | 4,359.5551709239 | | 2014 | 4,663.9980495216 | | 2013 | 4,542.2853082823 | | 2012 | 4,366.7500508028 | | 2011 | 4,123.7071409112 | | 2010 | 3,595.481849442 | | 2009 | 3,028.8697530039 | | 2008 | 3,105.661069219 | | 2007 | 2,659.5209211127 | | 2006 | 2,149.3441904195 | | 2005 | 1,830.7693587658 | | 2004 | 1,562.1595743243 | | 2003 | 1,337.6692616595 | | 2002 | 1,209.3422198799 | | 2001 | 1,202.4589652434 | | 2000 | 1,201.853430729 | | 1999 | 1,128.5153623291 | | 1998 | 1,178.6331630072 | | 1997 | 1,221.8541223644 | | 1996 | 1,163.2821830554 | | 1995 | 1,064.3481226282 | | 1994 | 945.51977733247 | | 1993 | 850.67296210088 | | 1992 | 787.15399463025 | | 1991 | 726.85410606243 | | 1990 | 702.82312519843 | | 1989 | 616.01608861832 | | 1988 | 585.57977750793 | | 1987 | 545.36730887688 | | 1986 | 551.95749757132 | | 1985 | 532.75448261561 | | 1984 | 522.40351796768 | | 1983 | 519.87169024838 | | 1982 | 539.96939581635 | | 1981 | 554.70389337033 | | 1980 | 511.21963344054 | | 1979 | 446.89468009575 | | 1978 | 395.37050273287 | | 1977 | 375.63462208848 | | 1976 | 338.82849938404 | | 1975 | 321.30371928255 | | 1974 | 304.48388709412 | | 1973 | 256.93995740153 | | 1972 | 204.84022375867 | | 1971 | 187.29243844876 | | 1970 | 175.07145891039 |
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