Year	constant 2010 US$
1980	194.052123260886
1981	198.916275795323
1982	180.986806839188
1983	149.506421200899
1984	137.616315023294
1985	137.59572005337
1986	133.967431355565
1987	153.927542196345
1988	166.919571215809
1989	177.103886075908
1990	176.37722066692
1991	180.289551233453
1992	164.942839610137
1993	172.350967754832
1994	175.902031984705
1995	173.620746212567
1996	213.645768270094
1997	230.501864762035
1998	251.446979564381
1999	264.3532819414
2000	261.692204306287
2001	286.726561978418
2002	302.926636653661
2003	313.156902681318
2004	327.792550830097
2005	346.23371016203
2006	369.765044790193
2007	386.35186649542
2008	401.735837325588
2009	415.718926444889
2010	431.515471518473
2011	449.694380772883
2012	468.973457897011
2013	488.74344178427
2014	510.63357032469
2015	529.091057732145
2016	533.458493191462
2017	537.572286171055
2018	539.183340263272