| Year | Value | | 2021 | 1,919 | | 2020 | 1,911 | | 2019 | 1,911 | | 2018 | 1,911 | | 2017 | 1,911 | | 2016 | 1,911 | | 2015 | 1,877 | | 2014 | 1,767 | | 2013 | 1,767 | | 2012 | 1,767 | | 2011 | 1,767 | | 2010 | 1,767 | | 2009 | 1,767 | | 2008 | 1,765 | | 2007 | 1,766 | | 2006 | 1,771 | | 2005 | 1,771 | | 2004 | 1,782 | | 2003 | 1,774 | | 2002 | 1,775 | | 2001 | 1,696 | | 2000 | 1,905 | | 1999 | 1,905 | | 1998 | 1,998 | | 1997 | 1,998 | | 1996 | 1,997 | | 1995 | 2,002 |
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