Year constant 2011 international $ 1995 11136.6314278906 1996 11891.457326114 1997 12647.4941593543 1998 13229.8545398254 1999 13857.2343598408 2000 14667.3076237217 2001 14869.2551005579 2002 15177.5419155671 2003 15631.4662841132 2004 16078.250744168 2005 16890.681142872 2006 17880.4057435853 2007 18902.7767234673 2008 20031.4546039498 2009 20314.5010520329 2010 20985.7836369254 2011 22024.8753766785 2012 22355.9973627466 2013 22766.4801890007 2014 23446.5042915542 2015 24368.7401655328 2016 25041.8743302801 2017 26181.9422393255 2018 27625.7953452298