| Year | Value | | 2022 | 22,068 | | 2021 | 21,548 | | 2020 | 20,959 | | 2019 | 20,298 | | 2018 | 19,604 | | 2017 | 18,773 | | 2016 | 17,972 | | 2015 | 17,207 | | 2014 | 16,520 | | 2013 | 15,886 | | 2012 | 15,332 | | 2011 | 14,802 | | 2010 | 14,226 | | 2009 | 13,613 | | 2008 | 12,959 | | 2007 | 12,257 | | 2006 | 11,589 | | 2005 | 10,946 | | 2004 | 10,314 | | 2003 | 9,687 | | 2002 | 9,067 | | 2001 | 8,494 | | 2000 | 7,997 | | 1999 | 7,555 | | 1998 | 7,161 | | 1997 | 6,834 | | 1996 | 6,432 | | 1995 | 6,078 | | 1994 | 5,767 | | 1993 | 5,491 | | 1992 | 5,248 | | 1991 | 5,028 | | 1990 | 4,820 |
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