| Year | Value | | 2021 | 5,918 | | 2020 | 5,918 | | 2019 | 5,923 | | 2018 | 5,926 | | 2017 | 5,926 | | 2016 | 5,926 | | 2015 | 5,923 | | 2014 | 5,944 | | 2013 | 5,944 | | 2012 | 5,944 | | 2011 | 5,944 | | 2010 | 5,919 | | 2009 | 5,919 | | 2008 | 5,919 | | 2007 | 5,899 | | 2006 | 5,905 | | 2005 | 5,732 | | 2004 | 5,741 | | 2003 | 5,851 | | 2002 | 5,850 | | 2001 | 5,850 | | 2000 | 5,854 | | 1999 | 5,836 | | 1998 | 5,867 | | 1997 | 5,865 | | 1996 | 5,859 | | 1995 | 5,880 |
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