Year	current US$
1981	426666.677
1992	2720000
1993	9050000
1994	8550000
1995	8970000
1996	23300000
1997	17900000
1998	21600000
1999	27200000
2000	27400000
2001	24100000
2002	53100000
2003	50400000
2004	80627000
2005	54806000
2006	48429000
2007	61144000
2008	72154442.74
2009	85624875.03
2010	128119878.587356
2011	138270000
2012	183688021.187932
2013	122837355.318773
2014	122229530.323596
2015	131992083.343423
2016	137963412.603401
2017	139331508.19052
2018	142391133.689795
2019	149060525.506631
2020	130319223.245137
2021	196704925.737236
2022	153417735.554229