Year	current US$
1970	37499999.748542875
1971	27600000.37029383
1972	33959999.66561798
1973	40380000.555887856
1974	37279999.637976274
1975	55130000.85018578
1976	61710000.64164407
1977	64299999.27245083
1978	89759999.0349262
1979	114670001.03183086
1980	205249996.61371118
1981	179800001.69575217
1982	173219994.5710599
1983	127669997.45182692
1984	103900000.35986306
1985	163400000.82179904
1986	116650002.23740941
1987	174980002.82980487
1988	250719998.71172032
1989	282650001.063943
1990	206439998.8614023
1991	365700003.3762306
1992	243269996.36553213
1993	187760001.7767399
1994	243060003.50788236
1995	208610000.26762488
1996	175559998.4899163
1997	218000000.9164214
1998	229490002.59116304
1999	195099999.34397626
2000	246280002.00167295
2001	402769993.865862
2002	454000003.09199136
2003	658459995.6255407
2004	1467870001.7333043
2005	4327449917.018418
2006	4685310002.986347
2007	1654280012.588947
2008	2258499975.2659354
2009	1886670046.9069176
2010	1948969994.7535992
2011	2653619974.298403
2012	2449080024.1846585
2013	2978640025.9863586
2014	3322880023.1292844
2015	3513940006.654711
2016	3355490041.069687
2017	3447420026.7810383
2018	3277530023.5375752
2019	3480040037.3004384
2020	3059489978.6803885
2021	1938230010.3604813
2022	1873289998.505265