Year	current US$
1990	173000000
1991	2378800000
1992	532600000
1993	1172000000
1994	2086100000
1995	309300000
1996	5084420000
1997	3092740000
1998	1670500000
1999	695550000
2000	1558500000
2001	642230000
2002	1787110000
2003	4054650000
2004	782580000
2005	6628900000
2006	8351010000
2007	4494380000
2008	436750000
2009	2512870000
2011	1095370000
2012	1879400000
2013	4475760000
2014	5009410000
2015	2913740000
2016	3469630000
2017	12587440000
2018	25964800000
2019	22515500000
2020	2788890000
2021	6504820000
2022	28433590000