Year | Value | 2023 | 20,849 | 2022 | 20,881 | 2021 | 20,294 | 2020 | 20,188 | 2019 | 19,915 | 2018 | 21,077 | 2017 | 22,683 | 2016 | 22,491 | 2015 | 22,688 | 2014 | 21,905 | 2013 | 22,347 | 2012 | 24,015 | 2011 | 25,106 | 2010 | 25,210 | 2009 | 26,005 | 2008 | 26,238 | 2007 | 26,247 | 2006 | 25,783 | 2005 | 25,432 | 2004 | 24,770 | 2003 | 23,785 | 2002 | 24,189 | 2001 | 24,379 | 2000 | 23,224 | 1999 | 22,508 | 1998 | 22,724 | 1997 | 22,602 | 1996 | 22,475 | 1995 | 23,675 | 1994 | 24,982 | 1993 | 26,412 | 1992 | 24,608 | 1991 | 24,029 |
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