Year	current US$
2002	4531692.72335576
2003	4630739.4613751
2004	4742088.06332913
2005	5230319.27556698
2006	5240712.42826649
2007	6107512.83313532
2008	5483678.24880391
2009	5925939.19055337
2010	6174691.94928229
2011	6619571.20743399
2012	7460666.38113661
2013	7098954.36382385
2014	6736086.97009484
2015	6682293.87755925
2016	6519229.39121087
2017	6518201.21441901
2018	6731938.06360025
2019	7161371.89739993
2020	7798484.33720725