Year	current US$
1994	6379000000
1996	13456520000
1997	14872640000
1999	6265010000
2001	5141130000
2002	3012010000
2004	4175990000
2005	18006870000
2006	26523550000
2007	28370700000
2008	24963050000
2009	21381980000
2012	54777840000
2013	35094860000
2016	20324690000
2017	34393240000
2019	49283210000
2021	40529980000
2022	56014480000