| Year | Value | | 2021 | 6,358.9277028212 | | 2020 | 5,721.1062113116 | | 2019 | 6,847.1618278051 | | 2018 | 6,982.272667574 | | 2017 | 7,301.9605299319 | | 2016 | 6,598.9853993847 | | 2015 | 6,867.8092228157 | | 2014 | 8,145.9415105614 | | 2013 | 8,063.1716375271 | | 2012 | 7,879.9697439435 | | 2011 | 7,937.6431571282 | | 2010 | 7,177.7987534088 | | 2009 | 5,901.664793159 | | 2008 | 6,358.1681939383 | | 2007 | 5,538.9628087836 | | 2006 | 4,692.0954863869 | | 2005 | 4,019.5975976633 | | 2004 | 3,379.1407210893 | | 2003 | 2,992.7956165725 | | 2002 | 3,006.4498553241 | | 2001 | 3,440.7570153082 | | 2000 | 3,568.3624472222 | | 1999 | 3,299.8428614504 | | 1998 | 3,790.7865638701 | | 1997 | 3,838.1513267137 | | 1996 | 3,558.6331789184 | | 1995 | 3,322.5157505659 | | 1994 | 3,115.3432679912 | | 1993 | 2,705.2514752791 | | 1992 | 2,351.0392766697 | | 1991 | 2,174.8259975485 | | 1990 | 2,002.1043037701 | | 1989 | 1,757.433615921 | | 1988 | 1,636.8237767949 | | 1987 | 1,470.3235857227 | | 1986 | 1,430.4992158889 | | 1985 | 1,425.5038243317 | | 1984 | 1,474.0315366265 | | 1983 | 1,498.9947339386 | | 1982 | 1,788.6227855371 | | 1981 | 1,991.7746947576 | | 1980 | 1,756.2734624215 | | 1979 | 1,510.4084428787 | | 1978 | 1,334.7225199856 | | 1977 | 1,211.9021543778 | | 1976 | 1,127.0255964368 | | 1975 | 1,044.0523310381 | | 1974 | 1,021.8187516789 | | 1973 | 819.75709946489 | | 1972 | 637.93506600124 | | 1971 | 583.50259920995 | | 1970 | 529.05499432272 |
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