Year constant 2011 international $ 1990 37153.7138513278 1991 36596.5356703678 1992 37350.0582511539 1993 37867.10959767 1994 38858.3159524347 1995 39448.9676143019 1996 40470.3067347719 1997 41718.202047562 1998 43048.6033179568 1999 44612.4639690171 2000 45974.4936245583 2001 46031.7838642785 2002 46379.4906886887 2003 47343.2256899041 2004 48752.1419621996 2005 49979.7634265413 2006 50795.2666847131 2007 51457.2791377429 2008 51048.3360477517 2009 49291.5621928741 2010 50296.807189096 2011 50812.6533881704 2012 51533.1813609331 2013 52091.5181949879 2014 52982.3271617612 2015 54039.3278406195 2016 54443.2197950637 2017 55350.5102175149