Year	current US$
1971	0.022966787979372533
1973	0.45041249412892553
1974	1.5213484774963768
1975	1.1165737485023575
1977	1.3858001790813972
1978	3.1377429942334394
1979	2.5653274705595206
1980	2.82270846627926
1981	3.292661317519012
1982	2.5698939775962355
1983	2.5002583600305366
1984	2.4329663699168576
1986	0.5129228343500318
1987	0.9998225315006586
1988	0.9748745580162472
1990	2.0930621965059815
1992	0.5205207497789088
1993	34.17247895799561
1994	75.47123324185264
1995	68.74124720062535
1996	69.56048037901782
1997	53.89775883610779
1998	72.67668906620463
1999	63.59917585327079
2000	74.39570905037486
2001	115.64112673000906
2002	88.9800826909635
2003	119.45473204281241
2004	95.36975651384729
2005	123.50744711518428
2006	43.814558224823294
2007	43.28869640052964
2008	38.53244024089064
2009	44.29473641828626
2010	51.564191417678224
2011	41.59223451463538
2012	41.80045929893137
2013	24.66654882741934
2014	25.332300997135878
2015	28.11970941637389
2016	19.855661551250815
2017	23.31220616992043
2018	24.450175180914904
2019	76.01138790500993
2020	17.24192275227624
2021	12.139837882187917
2022	14.850576510864373