Year	current US$
1960	2.6951377398768246
1961	2.8539458632120454
1962	2.8798307744728215
1963	3.2664808160366303
1964	3.64790429765873
1965	3.727928442843703
1966	3.62942994506845
1967	3.6873182921030576
1968	3.0498531326549148
1969	2.9752332024978148
1970	3.1169825587318596
1971	3.3274791277663134
1972	3.2688884754317282
1973	4.449328354276318
1974	6.310484830980729
1975	8.400469278395379
1976	7.8596133071589005
1977	7.709806104362208
1978	9.051513206691453
1979	9.455718869359437
1980	11.555046413253699
1981	10.21065283955462
1982	9.385880848170943
1983	8.433966264962182
1984	8.298129041632636
1985	8.32887590888298
1986	9.73558456192168
1987	9.905741149020246
1988	10.704287688277885
1989	10.853242892492048
1990	15.081833672648742
1991	15.545455087456801
1992	14.438917418241276
1993	11.43437599271025
1994	13.19784689248217
1995	12.16404880329024
1996	11.14178783352685
1997	9.398504081930243
1998	9.671391609074677
1999	9.07684214099941
2000	8.505942995564704
2001	9.327662655223845
2002	9.436091944449997
2003	10.077151077086043
2004	11.31565316010834
2005	14.050735976987928
2006	16.71942999924429
2007	11.955135388515263
2008	12.611979855032203
2009	13.311479187932655
2010	16.226599543657123
2011	16.20061797154572
2012	17.321639505096
2013	20.420477219761697
2014	19.226131857687346
2015	17.585061845540107
2016	16.647666479123412
2017	17.341600341918777
2018	16.14262263019051
2019	16.81422300105332
2020	20.860381806647393
2021	21.311515625260853
2022	28.530152931896367