Year	constant 2015 US$
1960	7410.305028696388
1961	7687.517338041697
1962	7498.8400606558
1963	6986.564802060012
1964	7572.231166175603
1965	8241.529336668093
1966	8059.450431462795
1967	8187.373350676681
1968	8450.037064173017
1969	9126.186479092554
1970	9257.89557164576
1971	9628.037837894917
1972	9630.010366009139
1973	9739.416270641852
1974	10105.049507529686
1975	9935.938634690023
1976	9581.841403111364
1977	10083.815182891782
1978	9476.06343622627
1979	10278.924623818135
1980	10270.956118001415
1981	9585.206771821444
1982	9366.17037951494
1983	9622.34731895272
1984	9624.404556368658
1985	8987.933705691756
1986	9397.88360849477
1987	9507.339812642806
1988	9262.96392660836
1989	8473.02656895128
1990	8144.49429397801
1991	8762.661383513321
1992	9327.859450963599
1993	9957.256522304917
1994	10397.379287449578
1995	9969.331575797225
1996	10388.538710440795
1997	11097.382063461755
1998	11391.9451576314
1999	10880.206207483703
2000	10672.722035312107
2001	10090.653443428628
2002	8895.31964210751
2003	9581.969792194684
2004	10341.643405880495
2005	11141.310671837527
2006	11913.958532263698
2007	12857.09257709611
2008	13246.634891715215
2009	12336.861938523742
2010	13551.339194022945
2011	14200.269889060848
2012	13895.63370729862
2013	14071.508683155722
2014	13567.948415980865
2015	13789.060424772022
2016	13360.211834598183
2017	13595.037355108117
2018	13105.397163316997
2019	12716.224203854397
2020	11346.652112846077
2021	12444.318266973089
2022	12940.73843521567
2023	12625.469550909564