| Year | Value | | 2021 | 9,714 | | 2020 | 9,711 | | 2019 | 9,701 | | 2018 | 9,708 | | 2017 | 9,684 | | 2016 | 9,684 | | 2015 | 9,716 | | 2014 | 9,689 | | 2013 | 9,765 | | 2012 | 9,944 | | 2011 | 10,014 | | 2010 | 9,968 | | 2009 | 9,946 | | 2008 | 9,840 | | 2007 | 9,821 | | 2006 | 9,869 | | 2005 | 9,867 | | 2004 | 9,895 | | 2003 | 9,882 | | 2002 | 9,940 | | 2001 | 9,865 | | 2000 | 10,698 | | 1999 | 10,705 | | 1998 | 10,929 | | 1997 | 10,738 | | 1996 | 10,923 | | 1995 | 10,884 |
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