Year US Dollars adjusted for inflation) 1995 5322.41953 1996 5639.23689 1997 6152.13699 1998 6659.5981 1999 6630.91457 2000 6933.58787 2001 7447.07745 2002 8014.63691 2003 8931.51954 2004 9624.01373 2005 10537.91037 2006 11500.52915 2007 12928.25994 2008 13405.18824 2009 11546.82225 2010 11984.86857 2011 12999.42674 2012 13679.149 2013 14301.72976 2014 14935.53502 2015 15383.46264 2016 15945.52348 2017 16793.25004