Year	current US$
1990	8620200000
1994	6430200000
1996	13628520000
1997	14771940000
1998	13933400000
1999	5774510000
2000	6205700000
2001	5076130000
2002	2973010000
2003	6959290000
2004	3973490000
2005	15589550000
2006	26248910000
2007	27321800000
2008	23409050000
2009	20473060000
2011	31281320000
2012	57665340000
2013	30929560000
2014	53047890000
2015	65580560000
2016	18904090000
2017	33494870000
2018	49135770000
2019	42168360000
2020	13566200000
2021	40562690000
2022	54538050000