Year	current US$
1984	7300000
1985	11500000
1986	11500000
1987	11500000
1988	11500000
1989	30100000
1990	25900000
1991	30100000
1992	30100000
1993	30100000
1994	242100000
1995	432430000
1996	96600000
1997	13614850000
1998	9490130000
1999	4514240000
2000	7444500000
2001	3683540000
2002	3678930000
2003	3688350000
2004	1757100000
2005	3751790000
2006	5654000000
2007	8034900000
2008	8891200000
2009	23150210000
2010	11218100000
2011	16055100000
2012	29729630000
2013	9576120000
2014	9440600000
2015	5573180000
2016	14598300000
2017	5813300000
2018	4947340000
2019	6309570000
2020	5899740000
2021	2670270000
2022	5151490000