Year	current US$
1997	238200000
1998	151260000
1999	100990000
2000	56520000
2001	104500000
2002	143000000
2003	220680000
2004	828200000
2005	1421570000
2006	1604660000
2007	2787110000
2008	1225040000
2009	1649630000
2010	1677610000
2011	2930150000
2012	2005700000
2013	1484440000
2014	1550730000
2015	1759480000
2016	1721030000
2017	2351360000
2018	2434860000
2019	2044510000
2020	2933430000
2021	2169860000
2022	2434690000