Year US Dollars adjusted for inflation) 1993 510.11321 1994 321.35981 1995 341.97421 1996 351.36672 1997 355.23412 1998 362.1862 1999 398.38277 2000 431.30466 2001 454.07645 2002 475.05373 2003 506.70279 2004 550.09994 2005 613.27901 2006 669.03633 2007 726.46058 2008 763.69139 2009 752.97792 2010 785.69288 2011 827.97841 2012 874.16149 2013 923.11382 2014 972.97924 2015 1024.87234 2016 1079.11354 2017 1135.1519