Year	current US$
1990	1671601778.69349
1991	1830060933.64674
1992	2036864144.02838
1993	2332205660.13897
1994	2488422691.95623
1995	2273021414.14695
1996	2541369634.73926
1997	2890508941.62378
1998	2855352845.99157
1999	2906022594.88609
2000	2794129006.72757
2001	2927177263.40304
2002	2803101820.76369
2003	3256620152.16445
2004	3544214116.53061
2005	4643184862.92226
2006	4919919409.87258
2007	5909771914.74257
2008	5184322075.28759
2009	7964676043.32145
2015	22108021301.5157
2016	25556907282.5751
2017	29488230974.7971
2018	27044705822.3833
2019	22472362539.0838
2020	21307686913.6104