Year	current US$
1996	2396000000
1997	2684000000
1998	2391000000
1999	1891350000
2000	1554260000
2001	1228000000
2002	1326450000
2003	1417740000
2004	2206290000
2005	4809840000
2006	8143960000
2007	10745910000
2008	9583570000
2009	12849820000
2010	12697350000
2011	9047140000
2012	9078600000
2013	10668220000
2014	11328150000
2015	11380950000
2016	12122530000
2017	11491770000
2018	9675180000
2019	7735800000
2020	6702770000
2021	10577280000