Year	current US$
1971	668955025.42123
1972	713718669.307178
1973	892353165.166911
1974	980502425.692667
1975	986516331.11435
1976	1012638412.44976
1977	1226500191.18651
1978	1639023227.0911
1979	1902132843.64961
1980	2286257314.01859
1981	1928105498.19916
1982	1771735994.16671
1983	1593442751.47115
1984	1252425980.34629
1985	1308393205.65554
1986	1754267257.45609
1987	2003213097.19186
1988	2060927940.1688
1989	2028215250.38499
1990	3264574412.88388
1991	3095102808.56677
1992	3222109951.49644
1993	2873789714.11887
1994	1826269428.07196
1995	2185266099.50481
1996	2288550957.67917
1997	2169969693.56914
1998	2648872809.41246
1999	2553897279.89885
2000	2247317475.59944
2001	2495755153.11286
2002	2857410502.70957
2003	3482451258.57152
2004	3933749904.89436
2005	4632466001.46586
2006	4984370193.03464
2007	5969560088.68688
2008	7610763509.61996
2009	7651531993.93302
2010	8196842543.59296
2011	9170109297.63107
2012	9524128672.39347
2013	10214881101.9451
2014	10864667207.0399
2015	9860806999.20606
2016	10381389644.3238
2017	11137135734.0065
2018	13042169978.1114
2019	12983870917.8237
2020	12632406101.0992
2021	14510811837.5892