Year	current US$
1990	23271076.3986367
1991	31813750.3085592
1992	35626377.0287971
1993	45499957.281241
1994	51516252.919873
1995	62820888.3552885
1996	65526560.7362447
1997	76182881.6883454
1998	81212065.2379113
1999	83610305.5337703
2000	81761433.6773496
2001	79940833.7115548
2002	83968207.0062707
2003	84101019.8179944
2004	80930606.7909151
2005	80260093.0234248
2006	81336047.7547858
2007	86791201.2931573
2008	95407784.5333565
2009	106783791.994815
2010	111058855.957283
2011	125603454.790958
2012	146943110.836739
2013	158252931.879753
2014	162007927.74351
2015	167258197.774254
2016	162892228.237695
2017	162969692.970414
2018	175720477.311639
2019	188689476.350562
2020	148971981.84129
2021	117545355.017217