Year	current US$
1987	370000
1988	620000
1989	320000
1990	130000
1991	4760000
1992	5180000
1993	5940000
1994	15340000
1995	14100000
1996	9200000
1997	24760000
1998	31830000
1999	27530000
2000	21150000
2001	8189999.999999999
2002	45600000
2003	56760000
2004	85860000
2005	111580000
2006	91950000
2007	120420000
2008	143470000
2009	161020000
2010	333240000
2011	346370000
2012	416610000
2013	515150000
2014	541950000
2015	579580000
2016	577490000
2017	587400000
2018	641660000
2019	721620000
2020	742260000
2021	844120000
2022	802810000