Year	current US$
1990	19984280.3171459
1991	19649092.3384581
1992	19849763.6749703
1993	21239211.5572887
1994	21870887.450279
1995	22754441.9079827
1996	23315789.1910292
1997	23220612.5796907
1998	23362682.5830579
1999	22838409.0119004
2000	22375457.7797948
2001	21753002.6105855
2002	20983637.7036185
2003	20453077.2356885
2004	21059041.2472367
2005	21528789.6100989
2006	22497917.9498613
2007	24155968.8186785
2008	26042971.3129393
2009	27553770.3593111
2010	29846415.6460518
2011	32194603.5407483
2012	34868070.5131266
2013	40944165.1863372
2014	45146984.165104
2015	50574930.1252149
2016	55020909.4248488
2017	59073659.4740944
2018	60316272.2910827
2019	61273695.8221572
2020	63542199.8879254
2021	67019484.1000994