Year	current US$
1960	0.34809266946055284
1961	0.5569979637136955
1962	0.604850909861233
1963	0.5677924363906037
1964	0.40427335681385485
1965	0.39600609085960264
1966	0.45456677321417227
1967	0.32972195179228647
1968	0.2590310962528359
1969	0.2765481779558358
1970	0.2339650821609795
1971	0.3158495182276946
1972	0.41889774086611126
1973	0.3193257337658755
1974	0.2265375348798418
1975	0.20087245079292237
1976	0.34743056769582636
1977	0.31254786467621004
1978	0.2949340358416592
1979	0.8242513966989632
1980	1.3883568942146947
1981	1.0535679751918663
1982	0.9246161532970107
1983	0.5553877972480027
1984	0.4133671842958648
1985	0.39517048805135335
1986	0.5750723401170912
1987	0.6477332266673291
1988	0.5363990307414157
1989	0.36549226169831467
1990	1.7378360879129573
1991	2.7706052095335743
1992	2.9148968754300317
1993	4.491252762399574
1994	3.551891498089779
1995	3.8830457387550945
1996	3.9263963445745826
1997	3.2187512297826353
1998	3.5564666225141126
1999	5.594929158604258
2000	5.294576146435203
2001	5.205762702120918
2002	7.342875419669472
2003	5.299934518695065
2004	5.525757020817525
2005	5.667207034733631
2006	7.084938790910984
2007	6.2070015970201275
2008	7.776954084270048
2009	8.253034942719014
2010	8.196976636502272
2011	11.71640956868332
2012	11.173883158100542
2013	10.011451843686363
2014	11.496054245721156
2015	9.424439385023787
2016	10.681234242161155
2017	10.700820182660582
2018	8.958195120087824
2019	7.921256944274418
2020	11.08953876096754
2021	10.984173396492952
2022	39.36509005737867