Year	current US$
1998	4099999.90463257
1999	9199999.80926514
2000	9899999.61853027
2001	6199999.80926514
2002	6900000.09536743
2003	7400000.09536743
2004	7699999.80926514
2005	7300000.19073486
2006	6699999.80926514
2007	5000000
2008	7699999.80926514
2009	8300000.19073486
2010	11100000.3814697
2011	15899999.6185303
2012	15000000
2013	30600000.3814697
2014	56000000
2015	62099998.4741211
2016	68800003.0517578
2017	65900001.525878906
2018	71900001.5258789
2019	44700000.762939505
2020	16399999.618530298