Year	current US$
1960	9.112195161088438
1961	10.730244420796929
1962	9.57352163415748
1963	8.22531227088578
1964	7.292153136704999
1965	5.652710897347027
1966	5.1367543844338535
1967	3.7897894379918333
1968	3.5231936587333896
1969	3.7934236269715957
1970	7.099958337696132
1971	6.780234046406891
1972	7.374732533162769
1973	15.390384760723062
1974	24.15878833905454
1975	35.81159028628761
1976	33.86649086213222
1977	38.462048793016194
1978	39.49846178422876
1979	41.698439232572824
1980	46.16176694101821
1981	42.79027644701467
1982	33.533804514406825
1983	25.71544709217049
1984	24.085933677094523
1985	25.13254590218188
1986	22.277972671309207
1987	24.192284556743477
1988	18.20765222335495
1989	18.123413160699737
1990	51.23760843592841
1991	47.81810992605387
1992	29.351464461390883
1993	23.038244611085556
1994	27.567239291830848
1995	21.400429263850118
1996	22.11683175698618
1997	20.29894061745601
1998	19.93559939787027
1999	18.76540770205686
2000	16.39529600282963
2001	16.885718880202994
2002	15.83272862383676
2003	27.28387504152464
2004	34.719190577572604
2005	90.46439810085909
2006	53.78692163341082
2007	55.11953281481837
2008	72.92584951872321
2009	38.398867646213105
2010	35.8136985641044
2011	44.59225331296899
2012	38.33570298043377
2013	71.18266434980023
2014	87.69031012281958
2015	51.06924989981166
2016	68.73649743208897
2017	71.7231046111391
2018	80.6418135281939
2019	68.30943347611209
2020	68.34744581339628
2021	82.81940333820893
2022	69.69239242298244