Year	current US$
1975	1.3890817858706181
1977	1.3439053590219836
1979	2.636435480222146
1980	3.929272996653268
1981	3.9006630255425434
1982	2.606882110657612
1983	3.830439138080657
1984	3.6923076097781786
1985	6.014675898599555
1986	4.690981483045655
1987	6.850096889929843
1988	19.951231118660722
1989	5.372877793365367
1990	16.670139239812567
1991	38.37608515770834
1992	40.47783556360164
1993	41.07177653891824
1994	1082.343769277701
1995	245.25009416341314
1996	314.1614306428226
1997	252.82253069179578
1998	204.29795562870575
1999	630.8388896017393
2000	385.46786161703767
2001	700.5693552911165
2002	1132.2577786715099
2003	1560.3247669807035
2004	1330.4305757135946
2005	895.5223658769297
2006	1701.9623526096466
2007	2494.3995919306126
2008	3049.8877058594358
2009	2289.6511585239714
2010	2712.625787193194
2011	3649.7130000288735
2012	3410.570560310686
2013	2688.423414999065
2014	2058.5009559198998
2015	2793.920429146178
2016	1983.0375365196992
2017	2205.1018857115046
2018	3147.4336446911193
2019	4478.23951789109
2020	2293.950466910272
2021	2698.425251501335
2022	2801.5473380538992