| Year | Value | | 2021 | 4,122.25096 | | 2020 | 3,671.75128 | | 2019 | 3,647.245487 | | 2018 | 4,046.845537 | | 2017 | 4,050.523 | | 2016 | 4,034.485 | | 2015 | 3,976.315 | | 2014 | 4,018.719 | | 2013 | 3,611.016 | | 2012 | 3,557.787 | | 2011 | 3,551.185 | | 2010 | 3,573.621 | | 2009 | 3,599 | | 2008 | 3,557 | | 2007 | 3,349 | | 2006 | 3,563 | | 2005 | 3,399 | | 2004 | 3,381 | | 2003 | 3,231 | | 2002 | 3,222 | | 2001 | 3,225 | | 2000 | 3,216 | | 1999 | 3,143 | | 1998 | 3,151 | | 1997 | 3,184 | | 1996 | 3,234 | | 1995 | 3,232 |
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