Year	current US$
1992	1350000000
1993	1330000000
1994	3181700000
1995	1200000000
1997	215200000
1999	195000000
2001	1765300000
2002	12300000
2003	2050000000
2004	1210000000
2005	1600000000
2006	203000000
2009	181500000
2010	34000000
2011	24000000
2012	2315900000
2013	1283000000
2014	52000000
2015	2690500000
2016	22000000
2017	365300000
2018	143250000
2019	95030000
2021	1331500000
2022	47660000