Year	current US$
1991	184000000
1992	244000000
1993	109449996.94824201
1994	77709999.0844727
1995	136029998.779297
1996	17879999.1607666
1997	8550000.19073486
1998	6670000.07629395
1999	6429999.82833862
2000	4449999.80926514
2001	6110000.1335144
2002	6820000.17166138
2003	8489999.77111816
2004	12579999.923706101
2005	13920000.076293899
2006	16010000.2288818
2007	18889999.3896484
2008	21299999.237060502
2009	21659999.8474121
2010	17959999.084472697
2011	17639999.3896484
2012	15710000.038146999
2013	13760000.2288818
2014	14020000.4577637
2015	11949999.8092651
2016	6530000.20980835
2017	14550000.1907349
2018	14920000.076293899
2019	13529999.7329712
2020	52930000.3051758
2021	15039999.961853001
2022	12819999.6948242