Year	current US$
1991	613600000
1992	13400000
1993	1050700000
1994	314800000
1995	1008300000
1996	1553100000
1997	1027500000
1998	1066300000
1999	2527500000
2000	1953780000
2001	240000000
2002	390320000
2003	925070000
2004	4268670000
2005	979440000
2006	5534550000
2007	10236450000
2008	12889380000
2009	24503850000
2010	34474510000
2011	22038050000
2012	9246100000
2013	3104900000
2014	2816630000
2015	2086940000
2016	1686930000
2017	1311630000
2018	1639510000
2019	856350000
2020	3321000000
2021	1621240000
2022	2593530000