Year	current US$
1991	250000000
1992	45000000
1993	1612800000
1994	1099800000
1995	2238200000
1996	1460000000
1997	1238000000
1998	1100000000
2000	1642000000
2001	530000000
2003	317300000
2004	119000000
2005	23400000
2006	24800000
2007	13000000
2009	3383200000
2010	1451000000
2011	296460000
2012	978030000
2013	1204290000
2014	480000000
2015	4896390000
2016	2478400000
2017	1700000000
2018	19120000
2019	52500000
2020	59610000
2021	401710000
2022	245180000