Year	current US$
1960	419.6609350214306
1961	446.0728919265183
1962	477.8734744516033
1963	477.6196344156584
1964	494.62865718138096
1965	531.8331071576583
1966	564.5508908986557
1967	605.2790346371821
1968	747.206073728801
1969	767.4761570917208
1970	880.6362810028925
1971	1123.2126071597681
1972	1437.2238858407068
1973	2108.611339154611
1974	6068.406672818713
1975	5922.500544812596
1976	7693.399229764137
1977	8473.68713290472
1978	8714.614727888693
1979	11553.235042321245
1980	16176.204465632412
1981	17258.63631451841
1982	13680.76127319763
1983	10997.0556248962
1984	9717.412683168066
1985	8060.191756917725
1986	6449.578866891706
1987	6082.121343982192
1988	5998.21831307424
1989	6210.059896791646
1990	7349.697934593159
1991	7939.296248881239
1992	7932.7049372467845
1993	7450.662474558317
1994	7359.449778243901
1995	7588.766443917389
1996	8174.147065940391
1997	8323.831218218897
1998	7169.368329085374
1999	7697.2719533141735
2000	8795.261668969344
2001	8337.326448889698
2002	8380.956927442947
2003	9321.807246764378
2004	10935.011108759454
2005	13462.759304304584
2006	14848.60197098864
2007	15756.19084288402
2008	18944.859586126986
2009	15064.63013574583
2010	17958.944481336126
2011	22441.57410876066
2012	24069.19947734825
2013	23945.511989974028
2014	23862.798694107492
2015	20442.362562008428
2016	19930.411144032532
2017	20910.48213341463
2018	24175.581643182788
2019	23405.70874294345
2020	20398.0614331035
2021	24315.61532729709
2022	30447.882317160147
2023	28894.963351807983