Year	current US$
1991	613600000
1992	20100000
1993	1050700000
1994	2072500000
1995	2808600000
1996	4080000000
1997	1511200000
1998	1389300000
1999	2620950000
2000	1987380000
2001	859500000
2002	431070000
2003	977980000
2004	4379770000
2005	1965640000
2006	5873650000
2007	11962550000
2008	14438930000
2009	26427880000
2010	35501140000
2011	23125117000
2012	13500500000
2013	3495300000
2014	3505615000
2015	3270280000
2016	3571400000
2017	8017380000
2018	3112110000
2019	4706360000
2020	7359750000
2021	1871240000
2022	4165270000