Year	current US$
1996	17706790000
1997	35522950000
1999	14374590000
2001	14605870000
2003	18139850000
2005	16280030000
2006	20544750000
2007	25962460000
2008	34996910000
2010	67695067000
2011	65197547000
2012	85386670000
2013	47638970000
2014	39184095000
2015	37721825000
2016	41327201000
2017	51033760000
2018	32261580000
2019	28449110000
2020	29498340000
2021	20950410000
2022	24314720000