Year	current US$
1990	16723503.1611121
1991	19298444.0361695
1992	19763410.9794978
1993	20430205.3155282
1994	22278755.6244621
1995	25158749.0722206
1996	22823213.6388593
1997	25221919.2930356
1998	25107225.8963635
1999	26187012.3617686
2000	23497334.3435645
2001	25087987.3367312
2002	24870761.6034661
2003	23852959.2258755
2004	24942466.3224358
2005	25400190.1453061
2006	28028580.4318853
2007	28730429.4556405
2008	32711617.7016365
2009	31119026.1694773
2010	43219697.4454353
2011	45070008.456399
2012	53602006.7199424
2013	57258264.2839674
2014	56851729.0762142
2015	62276394.6567418
2016	61502613.190458
2017	63863819.2237938
2018	68782116.672162
2019	71424809.1800517
2020	73030255.5881037
2021	70565738.8732255