Year	current US$
1970	41642205.6967951
1971	36832766.0037681
1972	18656772.9354068
1973	25184718.0010586
1974	20451798.6096775
1995	41316448.8564721
1996	38142742.959703
1997	34289411.9728015
1998	27594439.9957668
1999	41909110.4361355
2000	54775464.9554489
2001	65324784.1237257
2002	69161595.090385
2003	75137802.3090517
2004	85310424.5905808
2005	99294555.3380347
2006	114192843.988688
2007	135515442.426207
2008	167311891.62185
2009	173261571.194586
2010	172432891.912403
2011	193724642.353815
2012	227456804.254679
2013	250814796.017891
2014	278167104.219394
2015	300784094.036853
2016	334543005.6421
2017	371038865.591131
2018	409999702.631603
2019	450204688.314851
2020	437866336.645874
2021	450783577.966216