| Year | Value | | 2021 | 68,102.73 | | 2020 | 67,955.63 | | 2019 | 67,414.07 | | 2018 | 69,249 | | 2017 | 67,368 | | 2016 | 66,687 | | 2015 | 66,030 | | 2014 | 65,808 | | 2013 | 65,436 | | 2012 | 64,600 | | 2011 | 64,460 | | 2010 | 63,974 | | 2009 | 64,015 | | 2008 | 63,273 | | 2007 | 63,327 | | 2006 | 63,332 | | 2005 | 63,485 | | 2004 | 63,221 | | 2003 | 63,122 | | 2002 | 63,140 | | 2001 | 63,028 | | 2000 | 62,759 | | 1999 | 62,810 | | 1998 | 62,495 | | 1997 | 62,725 | | 1996 | 62,915 | | 1995 | 62,660 |
|