| Year | Value | | 2021 | 3,612 | | 2020 | 3,615 | | 2019 | 3,615 | | 2018 | 3,607 | | 2017 | 3,605 | | 2016 | 3,602 | | 2015 | 3,607 | | 2014 | 3,631 | | 2012 | 3,592 | | 2010 | 3,582 | | 2009 | 3,578 | | 2008 | 3,513 | | 2007 | 3,374 | | 2006 | 3,500 | | 2005 | 3,544 | | 2004 | 3,536 | | 2003 | 3,521 | | 2002 | 3,518 | | 2001 | 3,454 | | 2000 | 3,471 | | 1999 | 3,472 | | 1998 | 3,470 | | 1997 | 3,422 | | 1996 | 3,380 | | 1995 | 3,368 |
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