Year	current US$
1987	1200000
1988	13510000
1989	40400000
1990	67580000
1991	78320000
1992	80090000
1993	50290000
1994	38080000
1995	108890000
1996	93300000
1997	138760000
1998	56750000
1999	97750000
2000	55530000
2001	68410000
2002	119900000
2003	146460000
2004	142150000
2005	377500000
2006	126580000
2007	415860000
2008	694090000
2009	969350000
2010	867970000
2011	536270000
2012	253680000
2013	157750000
2014	122020000
2015	75000000
2016	65910000
2017	97300000
2018	115080000
2019	112150000
2020	114520000
2021	165870000
2022	158760000