Year	constant 2010 US$
1991	449.849602697396
1992	420.812809667632
1993	429.98562387685
1994	414.831566239636
1995	424.191889367151
1996	444.969990556232
1997	443.235108755804
1998	439.422609534087
1999	447.519066031891
2000	442.349271932953
2001	449.905393108709
2002	463.647617130008
2003	456.186055995483
2004	454.363619493308
2005	468.239632607109
2006	475.526600686332
2007	516.503976973391
2008	527.087177929342
2009	546.544839380093
2010	565.722854766268
2011	566.933926259227
2012	589.08781860018
2013	589.056179946922
2014	604.114624406187
2015	606.366427178844
2016	601.333874771894
2017	610.747357701469
2018	636.981597208207