Year	current US$
1991	613600000
1992	20100000
1993	1047700000
1994	2072500000
1995	2808600000
1996	3789000000
1997	1502900000
1998	1245300000
1999	2328850000
2000	1862500000
2001	859500000
2002	51250000
2003	897680000
2004	2443570000
2005	1219700000
2006	5024780000
2007	10757850000
2008	13732530000
2009	22439330000
2010	30469390000
2011	22098317000
2012	13158800000
2013	3343100000
2014	3505615000
2015	3270280000
2016	3571400000
2017	8017380000
2018	3112110000
2019	4706360000
2020	7359750000
2021	1871240000
2022	4075080000