Year	current US$
1990	8620200000
1994	6450200000
1996	15160620000
1997	16186440000
1998	14756000000
1999	6532960000
2000	7634900000
2001	5502330000
2002	3216480000
2003	7244290000
2004	4412490000
2005	15775550000
2006	31165570000
2007	27574800000
2008	23855830000
2009	21178060000
2011	35565920000
2012	57749240000
2013	31661330000
2014	53111690000
2015	65606060000
2016	18927490000
2017	33569870000
2018	49228320000
2019	42594280000
2020	13566200000
2021	40562690000
2022	55494190000