| Year | Value | | 2021 | 5,760.75730066 | | 2020 | 5,248.581138836 | | 2019 | 6,269.9074865226 | | 2018 | 6,356.4264747939 | | 2017 | 6,009.0477685597 | | 2016 | 5,662.617480661 | | 2015 | 5,785.6676131136 | | 2014 | 5,976.6995220455 | | 2013 | 6,033.6221463983 | | 2012 | 5,176.9798121727 | | 2011 | 5,057.6108525023 | | 2010 | 5,132.8890149667 | | 2009 | 6,619.786 | | 2008 | 5,239.854 | | 2007 | 4,797.924 | | 2006 | 4,362.132 | | 2005 | 4,535.131 | | 2004 | 4,657.901 | | 2003 | 4,028.766 | | 2002 | 3,925.755 | | 2001 | 4,170.756 | | 2000 | 4,618.948 | | 1999 | 4,180.5000752957 | | 1998 | 4,664.7999948114 | | 1997 | 4,554.4999703915 | | 1996 | 3,511.9000796825 | | 1995 | 3,602.0000369103 | | 1994 | 3,615.4999866039 | | 1993 | 3,243.200059846 | | 1992 | 3,006.9000287203 | | 1991 | 2,682.6999441532 | | 1990 | 2,726.6000172643 | | 1989 | 2,599.7000050097 | | 1988 | 2,332.4999773055 | | 1987 | 2,394.8999933972 | | 1986 | 2,271.800029613 | | 1985 | 2,082.2000280394 | | 1984 | 1,997.0000313299 | | 1983 | 1,700.4999798312 | | 1982 | 1,830.300023891 | | 1981 | 1,704.9000196456 | | 1980 | 1,574.1999965905 | | 1979 | 1,430.9000087976 | | 1978 | 1,429.3999781757 | | 1977 | 1,296.7999832632 | | 1976 | 1,085.9000085741 | | 1975 | 972.8999977486 | | 1974 | 952.0000034347 | | 1973 | 779.4000192435 | | 1972 | 677.0000036731 | | 1971 | 558.5000006558 | | 1970 | 510.5000014899 |
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