Year US Dollars adjusted for inflation) 1995 8475.13993 1996 9322.35778 1997 9772.26066 1998 10111.22891 1999 9900.06352 2000 10569.02697 2001 10897.53979 2002 11469.27644 2003 12106.72816 2004 12603.86166 2005 13119.78216 2006 13753.79057 2007 14475.15214 2008 14777.35013 2009 13703.00181 2010 13542.90183 2011 13931.2814 2012 13660.25631 2013 13609.58431 2014 13651.99247 2015 14088.0751 2016 14635.88001 2017 15219.88279