Year	current US$
1990	1631137981.73613
1991	1790875370.35723
1992	1997857111.07153
1993	2291262211.87222
1994	2444026299.32618
1995	2221805717.30992
1996	2486266053.60509
1997	2830416431.48923
1998	2799208389.14657
1999	2848172633.73033
2000	2738037909.2911
2001	2874134979.01233
2002	2749634407.79224
2003	3194148543.9736
2004	3478073417.23559
2005	4555756475.56231
2006	4824864894.6544
2007	5803534334.71783
2008	5047200346.06242
2009	7820828918.46492
2015	21855070781.3561
2016	25292725281.4787
2017	29208692444.7347
2018	26767379695.8718
2019	22199965692.5386
2020	21034526747.4965