Year	current US$
1972	270471434.777885
1973	143195868.268889
1974	138200000
1975	148263262.412567
1976	288917105.667086
1977	232673820.519865
1978	315230279.580148
1979	386253589.087291
1980	299646394.40916
1981	138416395.465368
1982	182622698.652138
1983	524078485.093418
1984	389911548.850912
1985	336519683.655536
1986	409086690.396683
1987	843148731.007675
1988	1046059814.83226
1989	501459852.28796
1990	628650096.029364
1991	1278235593.4143
1992	1824601405.25527
1993	2410807604.77349
1994	3138702517.93058
1995	2339666010.15567
1996	1834622472.24747
1997	1581456188.83036
1998	1905410381.79284
1999	1603637022.87566
2000	1485964723.8122
2001	1275027661.37667
2002	1683213119.17036
2003	2577891706.05726
2004	3172440832.85791
2005	2767241063.68236
2006	3805600127.49565
2007	5183432281.25889
2008	5689282147.3445
2009	10218896711.2537
2010	10564279466.9521
2011	8509530151.12681
2012	12031218899.6072
2013	17564379091.112
2014	21785394951.0397
2015	27023378997.5949
2016	31776076223.0877
2017	32849189167.2112
2018	31452739129.2509
2019	32012890650.7125
2020	42322360138.5941
2021	45348046445.6095
2022	32929526841.3686
2023	20928020362.1212