Year	current US$
1990	8618300000
1991	3424300000
1992	3631600000
1993	4465000000
1994	6195200000
1995	6538820000
1996	12675220000
1997	13145640000
1998	13084500000
1999	5125810000
2000	5573300000
2001	3546830000
2002	2349310000
2003	6380150000
2004	2498090000
2005	13974720000
2006	14759940000
2007	20715080000
2008	16634710000
2009	15247730000
2011	13370820000
2012	31678340000
2013	25454990000
2014	49185140000
2015	60687240000
2016	13729670000
2017	27373020000
2018	40905550000
2019	31695810000
2020	5759780000
2021	30367560000
2022	41897230000