Year	current US$
1990	260623948.413806
1991	280440661.456483
1992	254533940.238905
1993	361480385.957882
1994	195285909.427804
1995	168275734.97565
1996	155515158.478392
1997	163155023.06996
1998	162894307.009966
1999	125114117.641836
2000	528866079.718381
2001	200576100.531281
2002	217415679.958991
2003	205310118.678977
2004	216978170.643648
2005	240011778.75316
2006	282855892.361661
2007	316710080.478441
2008	362411789.584378
2009	340320874.904365
2010	374371332.852593
2011	424901981.249327
2012	458483861.157514
2013	480140490.277322
2014	489314200.749233
2015	487608714.832259
2016	465504042.792161
2017	454605879.15874
2018	544685919.98684
2019	564612757.876777
2020	511898823.104494
2021	535215565.099158