Year	current US$
1991	15453273.3891887
1992	18561299.7791118
1993	20803318.0678694
1994	24300617.030663
1995	27334482.3094653
1996	29739266.6348528
1997	32750474.0251045
1998	36151341.8806585
1999	40666869.5524284
2000	52536611.1729459
2001	43941123.5383441
2002	48772027.5793931
2003	54322158.6250416
2004	60100028.6011707
2005	57686622.6787177
2006	61503926.7004337
2007	68025896.8261388
2008	80511303.8434451
2009	83552545.0038584
2010	89418723.781783
2011	97371279.4441246
2012	107778576.933228
2013	157226898.486796
2014	170963298.313345
2015	187065347.239263
2016	197020471.58082
2017	205677385.401121
2018	216240663.183353
2019	233697110.928944
2020	240524370.525438
2021	267065022.252878