Year	constant 2010 US$
1991	2668.14876670526
1992	2440.77316011464
1993	2340.16230907558
1994	2330.33936138273
1995	2231.735376159
1996	2205.75311095127
1997	2143.51406684152
1998	2171.9436088276
1999	2197.4318869121
2000	1822.26134742094
2001	1444.03712104837
2002	1351.29389501164
2003	1338.03384222048
2004	1777.87143147631
2005	1952.04150020963
2006	2080.14354199751
2007	2180.13161452624
2008	2252.21437781499
2009	2328.46846822798
2010	2298.24912670919
2011	2208.80998362201
2012	2487.77319075021
2013	3417.21930871653
2014	4080.20262577379
2015	4382.34703910907
2016	4503.34152902321
2017	4687.88740508181
2018	4853.08307781656