Year	current US$
1990	20301068.0231982
1991	19918655.2927052
1992	19694491.4643289
1993	19459642.6294079
1994	20770922.2915798
1995	21038375.8603037
1996	21003167.6036405
1997	21166406.73601
1998	19809812.6387471
1999	21193696.2882199
2000	28219165.0043003
2001	27822197.4933463
2002	28344649.4531432
2003	30384537.962405
2004	33513367.6794229
2005	37677510.3227496
2006	40376147.6387439
2007	42755007.5631694
2008	46727203.6975388
2009	40038440.1956376
2010	42806013.9079397
2011	47361316.5362317
2012	49124094.6002085
2013	50130483.6140458
2014	51243198.9920394
2015	48360734.7826117
2016	49910315.8781841
2017	54941705.2692851
2018	60825034.3743298
2019	64190316.0930297
2020	63620817.3943945
2021	74680768.7468064