| Year | Value | | 2021 | 4,018.926054549 | | 2020 | 3,655.7848216576 | | 2019 | 4,366.4815170943 | | 2018 | 4,817.4660429838 | | 2017 | 4,647.1726232272 | | 2016 | 3,913.2979060374 | | 2015 | 4,333.8214355836 | | 2014 | 4,828.3732701215 | | 2013 | 4,791.0592130729 | | 2012 | 5,048.3287534831 | | 2011 | 4,864.0863584431 | | 2010 | 4,473.4302543492 | | 2009 | 3,636.2934648209 | | 2008 | 3,565.6413681903 | | 2007 | 3,610.0995092451 | | 2006 | 3,448.2920777146 | | 2005 | 3,152.1529710177 | | 2004 | 3,021.2872369104 | | 2003 | 2,359.8756100756 | | 2002 | 1,588.6517624626 | | 2001 | 1,690.7182268552 | | 2000 | 1,922.9984325793 | | 1999 | 1,898.816226962 | | 1998 | 2,017.4031948838 | | 1997 | 2,202.6642572124 | | 1996 | 2,185.6934332561 | | 1995 | 2,281.0115558144 | | 1994 | 2,123.9335748044 | | 1993 | 1,917.5124605146 | | 1992 | 2,089.5014862436 | | 1991 | 1,917.6381760542 | | 1990 | 1,721.1225059088 |
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