Year	current US$
1993	1214.9210111131126
1994	908.7537274017857
1995	1128.9433915697866
1996	1176.3050277359075
1997	1235.7880798305887
1998	1613.2294377040123
1999	1458.0320730507092
2000	1502.3064247064588
2001	1217.2070543452198
2002	1411.5555833829574
2003	1810.00287946771
2004	2351.477133512018
2005	2931.480805811184
2006	3356.0268919763275
2007	4249.180296504517
2008	4992.289945014533
2009	4146.65713081572
2010	4903.351860934848
2011	5462.093793752871
2012	5784.293277368749
2013	6301.366661068791
2014	5996.732215824441
2015	5275.43708339528
2016	4977.2993011393655
2017	5020.683773994499
2018	4841.622175980803
2019	4866.654842147616
2020	4704.0093688938705