| Year | Value | | 2022 | 19,381.086224421 | | 2021 | 19,448.602943818 | | 2020 | 16,636.19822572 | | 2019 | 17,849.989596981 | | 2018 | 17,485.723053984 | | 2017 | 16,835.440054678 | | 2016 | 16,056.998610883 | | 2015 | 16,644.508962674 | | 2014 | 16,893.730437389 | | 2013 | 16,963.347397708 | | 2012 | 18,937.691806614 | | 2011 | 17,734.916089197 | | 2010 | 16,314.001702094 | | 2009 | 14,072.321327016 | | 2008 | 14,076.294835515 | | 2007 | 14,954.554668851 | | 2006 | 16,309.101992021 | | 2005 | 16,206.530588509 | | 2004 | 15,927.182633074 | | 2003 | 15,006.405418689 | | 2002 | 14,308.110882235 | | 2001 | 13,654.902828484 | | 2000 | 13,180.069737623 | | 1999 | 13,041.632653061 | | 1998 | 13,084.369724739 | | 1997 | 11,729.336966394 | | 1996 | 11,687.670953217 | | 1995 | 10,720.847713022 | | 1994 | 10,921.817406434 | | 1993 | 10,729.653592546 | | 1992 | 10,375.6571285 | | 1991 | 9,631.6832031448 | | 1990 | 10,377.690691202 |
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