Year constant 2010 US$ 2006 920.114553490392 2007 950.811148786677 2008 1066.72659280481 2009 1062.28600625667 2010 1215.5148003208 2011 1256.75424610244 2012 1305.48864919465 2013 1528.32407313939 2014 1554.61434242425 2015 1514.77438366563 2016 1442.28937602346 2017 1570.11210637866