Year US Dollars adjusted for inflation) 1995 5140.52816 1996 5321.39679 1997 5857.03658 1998 6298.1261 1999 6515.89272 2000 6934.72293 2001 7478.7631 2002 8103.58764 2003 8872.1032 2004 9717.10905 2005 10873.41429 2006 12278.30704 2007 13614.25637 2008 13270.00041 2009 11547.99077 2010 11326.21947 2011 12270.34062 2012 12924.72616 2013 13381.33173 2014 13758.95531 2015 14284.28833 2016 14733.83944 2017 15553.32797