Year	current US$
1971	5343600.84065187
1972	4308750.79637005
1973	2007764.78670068
1974	3132249.13557634
1975	3101300.12569122
1976	3458363.27253914
1977	3886127.70840746
1978	4653207.01682159
1979	6421690.905931
1980	9026085.79796951
1981	9475888.96131576
1982	9371662.41052062
1983	8986133.88299268
1984	10642384.5708877
1985	10933506.2648101
1986	9652663.15682461
1987	9479244.16617894
1988	11046723.275847
1989	10912958.822066
1990	12623373.6651696
1991	14056767.4460322
1992	16956370.2529193
1993	19022908.8768478
1994	27634514.4168808
1995	36860221.7521296
1996	40872092.3117472
1997	41862974.6838014
1998	37284988.2840391
1999	40136472.1485349
2000	33427189.8700865
2001	34351122.7295009
2002	27399564.0861305
2003	31833090.7651695
2004	37339619.4563448
2005	41376754.894088
2006	47806989.6669933
2007	54994007.2792322
2008	62276896.5124967
2009	66658585.5221117
2010	77305792.9862469
2011	86716398.8187931
2012	95184391.6808268
2013	100105138.082222
2014	104477104.794526
2015	105490312.328803
2016	110212354.071977
2017	125135160.283077
2018	134850313.598665
2019	135527544.584838
2020	134301798.061853
2021	144039388.166228