Year	current US$
1989	33181819.92
1990	26500000
1991	33000000
1992	233000000
1993	140000000
1994	255000000
1995	223000000
1996	142000000
1997	344200000
1998	108000000
1999	38800000
2000	32000000
2001	34700000
2002	14400000
2003	79100000
2004	12800000
2005	57200000
2006	135000000
2007	179600000
2008	241300000
2009	254800000
2010	304800000
2011	292900000
2012	292700000
2013	354900000
2014	351400000
2015	622700000
2016	352200000
2017	270800000
2018	514500000
2019	471900000
2020	444900000
2021	442100000
2022	395400000