Year	current US$
1990	1359788924.34499
1991	3436648211.2872
1992	3376167315.1554
1993	883544421.687361
1994	2562434756.31641
1995	1880958659.80419
1996	940790737.827341
1997	1045434041.70368
1998	1873971537.57675
1999	1441827331.84329
2000	3755475325.01549
2001	4873496714.13109
2002	5348826488.95771
2003	7032677159.29254
2004	9310957620.8046
2005	7623598571.82238
2006	6859720222.25595
2007	7433240926.74546
2008	1909067483.30305
2009	7820870277.6071
2010	9723483733.95962
2011	12653664647.8831
2012	10444117615.5515
2013	14033950177.1198
2014	17048583633.5458
2015	22062778086.9174
2016	21562005999.4865
2017	17623486736.6171
2018	14926924085.3072
2019	10823165421.2095
2020	19044249012.657
2021	21067066972.4636