Year	current US$
1990	25849454.9839484
1991	8046553.69844396
1992	24560410.828531
1993	25105877.6560377
1994	20389127.8885884
2001	23778904.618941
2002	23960429.9374969
2003	18007715.9101862
2004	23658290.3079456
2005	15374555.530206
2006	26589368.851959
2007	14590682.9039261
2008	8887515.40606212
2009	5004583.48536423
2010	16718023.4948684
2011	39965086.0594603
2012	67221532.3810369
2013	41789197.2526483
2014	39438497.7281415
2015	11634429.8361376
2016	29031533.504368
2017	64974759.562805
2018	74595227.2342779
2019	109633323.003257
2020	77279877.0921145
2021	-15022357.0758195