Year	current US$
1996	5560590000
1997	10562900000
1998	8989720000
1999	20824200000
2000	30999800000
2001	12452800000
2004	140292780000
2005	139436330000
2006	124830650000
2007	99831760000
2008	42279910000
2009	17593320000
2010	11653590000
2011	9637900000
2012	11976000000
2013	562900000
2014	539700000
2020	19293030000
2021	20860240000
2022	7617570000