Year constant 2011 international $ 2000 1365.90992655338 2001 1353.05039037712 2002 1336.38141175292 2003 1311.93618544977 2004 1321.92495103364 2005 1346.75351949367 2006 1359.13009696299 2007 1375.57542572024 2008 1369.48238870888 2009 1386.11220496037 2010 1424.25612209932 2011 1515.52262633243 2012 1449.42340511306 2013 1422.05283075459 2014 1476.84502480861 2015 1513.26746266066 2016 1569.53264499833 2017 1580.02621729055 2018 1593.18402521998