Year	current US$
1994	6399000000
1996	14988620000
1997	16287140000
1998	14481500000
1999	7023460000
2000	7978690000
2001	5567330000
2002	3293080000
2004	4614990000
2005	18192870000
2006	31296210000
2007	28600700000
2008	25410830000
2009	22086980000
2012	54777840000
2013	35823530000
2016	20348090000
2017	34468240000
2019	49325770000
2021	40529980000
2022	56970620000