Year	current US$
1960	281.46334219525244
1961	300.18773266364667
1962	403.6888635719224
1963	559.5381312324598
1964	811.9325697003187
1965	1061.7077860717045
1966	1329.1167559408295
1967	1533.2399889638032
1968	2116.4328408268043
1969	2351.8001873765634
1970	2410.279115033007
1971	2686.07026717105
1972	3129.6741173553974
1973	4138.5940262738
1974	6934.121661053439
1975	6418.818956885056
1976	7911.699181509144
1977	8823.767798163835
1978	8271.844109252175
1979	10840.372470319098
1980	13823.083163106192
1981	11688.360717937727
1982	10338.567309799466
1983	9697.569143713852
1984	8269.244072767808
1985	8558.058537238254
1986	6363.07921629147
1987	6824.661462235191
1988	6044.651669617091
1989	6091.150622725299
1990	6821.878587306543
1991	7368.041210941242
1992	7623.941556525266
1993	6745.930536505998
1994	6164.344994042292
1995	5396.37422672079
1996	5785.110698611883
1997	6262.491034878068
1998	5471.092009591991
1999	7112.668066914295
2000	7424.347866375315
2001	6465.624912764717
2002	3789.2052697246245
2003	4738.828475450602
2004	5823.637943405231
2005	8108.051516651869
2006	10060.358167500124
2007	11158.111104630992
2008	13921.903710784221
2009	9560.80753446227
2010	11611.362353476563
2011	7784.136358775271
2012	15765.41526969617
2013	12589.527943756879
2014	9408.753043250283
2015	7867.51493141091
2016	7945.004215293188
2017	10529.11635033026
2018	11838.29581651472
2019	10972.902519068002
2020	9872.111144276018
2021	7094.999820173277
2022	8211.380947902846
2023	7329.976541068432