| Year | Value | | 2020 | 21,625.9 | | 2019 | 21,625.9 | | 2018 | 21,625.9 | | 2017 | 21,625.9 | | 2016 | 21,603 | | 2015 | 20,975.23 | | 2014 | 21,625.9 | | 2013 | 21,625.9 | | 2012 | 21,642.5 | | 2011 | 21,665.4 | | 2010 | 21,705 | | 2009 | 21,678 | | 2008 | 21,676 | | 2007 | 21,873 | | 2006 | 21,891 | | 2005 | 22,001 | | 2004 | 22,011 | | 2003 | 22,079 | | 2002 | 22,079 | | 2001 | 22,219 | | 2000 | 22,302 | | 1999 | 22,473 | | 1998 | 22,510 | | 1997 | 22,546 | | 1996 | 22,602 | | 1995 | 22,607 |
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