Year	current US$
1975	35896079.2432281
1976	62537912.0554308
1977	76685985.3737153
1978	105931541.29139
1979	145705986.529408
1980	257429929.151422
1981	268090790.889054
1982	277371260.749681
1983	285741440.636058
1984	305700405.156966
1985	334311679.985811
1986	421591529.187215
1987	506338642.541474
1988	583377754.719339
1989	624592522.557256
1990	766711542.201524
1991	791862626.457602
1992	949419483.945812
1993	905598434.282264
1994	1019675175.54859
1995	1332525038.35659
1996	1389045459.0414
1997	1328461577.16862
1998	1392499814.95909
1999	1353768487.92515
2000	1252589648.16776
2001	1254997125.68721
2002	1383658156.60197
2003	1730503125.20527
2004	2053815513.67639
2005	2156492722.80534
2006	2304606782.86915
2007	2690874262.34149
2008	3185808537.70348
2009	3081492849.15898
2010	3126336068.46763
2011	3359819340.56302
2012	3141228992.11293
2013	3247637256.27214
2014	3226164075.07842
2015	2684022435.23688
2016	2644072624.3447
2017	2783756950.24696
2018	3025910032.59532
2019	3008254602.11717
2020	3189308406.33431
2021	3777710468.50419