Year	current US$
1990	68000000
1995	1760000000
1996	1232200000
2000	3575000000
2001	1700000000
2002	1260000000
2004	169000000
2005	60800000
2006	321050000
2007	81600000
2008	4434000000
2009	3816500000
2010	5427030000
2011	8551020000
2012	3360000000
2013	13591100000
2014	11072450000
2015	1578070000
2016	2836000000
2017	797100000
2018	957510000
2019	782950000
2020	408970000
2021	1134000000
2022	502000000