| Year | Value | | 2021 | 9,357 | | 2020 | 9,377 | | 2019 | 9,396 | | 2018 | 9,406 | | 2017 | 9,408 | | 2016 | 9,462.687 | | 2015 | 9,466.893 | | 2014 | 9,457.612 | | 2013 | 9,459.031 | | 2012 | 9,468.265 | | 2011 | 9,470.16 | | 2010 | 9,468.848 | | 2009 | 9,477 | | 2008 | 9,486 | | 2007 | 9,481 | | 2006 | 9,491 | | 2005 | 9,513 | | 2004 | 9,511 | | 2003 | 9,501 | | 2002 | 9,499 | | 2001 | 9,444 | | 2000 | 9,365 | | 1999 | 9,365 | | 1998 | 9,430 | | 1997 | 9,430 | | 1996 | 9,435 | | 1995 | 9,430 |
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