Year	current US$
1990	116000000
1991	10800000
1992	114500000
1993	351500000
1994	26700000
1995	502800000
1999	1028000000
2004	159200000
2006	372000000
2007	518600000
2009	220000000
2012	2662000000
2016	462000000
2017	6000000000
2018	2903430000
2021	6737290000
2022	93300000