| Year | Value | | 2018 | 7,680 | | 2017 | 7,680 | | 2016 | 6,230 | | 2015 | 6,230 | | 2014 | 3,115 | | 2013 | 3,115 | | 2012 | 3,115 | | 2011 | 3,115 | | 2010 | 3,115 | | 2009 | 3,110 | | 2008 | 3,095.1 | | 2007 | 3,181 | | 2006 | 3,069 | | 2005 | 2,529 | | 2004 | 2,529 | | 2003 | 2,523 | | 2002 | 2,523 | | 2001 | 2,523 | | 2000 | 2,521 | | 1999 | 2,365 | | 1998 | 2,393 | | 1997 | 2,313 | | 1996 | 2,313 | | 1995 | 2,153 |
|