Year	constant 2015 US$
1997	72325634.97396764
1998	60482858.497742206
1999	75599171.84159759
2000	66965499.496327795
2001	67480500.30442072
2002	77012059.94559364
2003	78615367.58375983
2004	79084005.23790263
2005	88834385.16088209
2006	91887019.37657852
2007	81540556.38381939
2008	87710547.70693068
2009	92267336.59433003
2010	93870180.1704008
2011	99295334.85107951
2012	94744502.0661939
2013	95201143.12107456
2014	101032075.53384118
2015	102088643.04305427
2016	106694438.24164657
2017	109076463.85152549
2018	153440378.4451036