Year	current US$
1997	169940000
1998	166120000
1999	58000000
2000	220160000
2001	189090000
2002	138990000
2003	2752110000
2004	2476990000
2005	1810120000
2006	158000000
2007	165000000
2008	159000000
2009	169000000
2010	238000000
2011	2275900000
2012	2006310000
2015	315630000
2018	437850000
2019	379050000
2020	644320000