Year	current US$
1987	75017.8397
1988	418023.3479
2000	13781411.5192009
2001	13974440.8500259
2002	23043884.5485818
2003	22610100.9049879
2004	24271990.0291386
2005	18816238.2960288
2006	31369185.5536586
2011	0
2013	419356298.146411
2014	565941089.77878
2015	382264665.651367
2016	297721233.568434
2017	96325534.8527011
2018	151129018.573935
2019	178868962.971662