Year	current US$
1970	574340.386160937
1971	601998.050525307
1972	773871.566710443
1973	1375098.46172237
1974	1415149.83321044
1975	1758624.08713016
1976	1463808.19540726
1977	2390293.60107919
1978	2451904.59730336
1979	2744811.83762757
1980	3266095.32975535
1981	3200905.00315608
1982	6838896.76949756
1983	2439518.20720705
1984	1490566.48177712
1985	997003.51968353
1986	996868.314063056
1987	997759.309818976
1988	966767.464613838
1989	967594.572982441
1990	2964118.2368523
1991	3437318.60877959
1992	3183420.70712673
1993	2460753.23299191
1994	2855392.55226703
1995	3654480.83099586
1996	2642462.64132818
1997	3469830.54735327
1998	2939939.96707661
1999	2450349.05638468
2000	2351623.00754585
2001	2337376.87934304
2002	2100096.19056509
2003	2228520.30627145
2004	2289309.32308755
2005	2325041.8061658
2006	8064802.22270727
2007	8582405.71620454
2008	8962048.03436541
2009	8263816.47010863
2010	18679193.7779935
2011	16949817.9861898
2012	17504267.0153047
2013	25108129.7474304
2014	32475866.4346904
2015	26726474.7927287
2016	36432970.7218148
2017	32460657.0525173
2018	24885070.3361147
2019	23977626.7126768
2020	27406009.8718329
2021	24451522.660871