Year	constant 2015 US$
1964	7662.9420185764175
1965	8179.562213774413
1966	8643.973327114321
1967	8991.219242795345
1968	9370.903611402444
1969	10157.14415544944
1970	10831.59041135695
1971	11356.125348826845
1972	11738.634640025926
1973	12096.29239337546
1974	12151.130506486259
1975	11812.489328647805
1976	11268.617472222628
1977	12423.094734629032
1978	12899.818717620032
1979	13601.040150028692
1980	13822.832958725683
1981	13814.823200181638
1982	13374.502907746835
1983	12845.924120656735
1984	13193.4500975054
1985	13455.351906755828
1986	13791.583033673594
1987	14230.309049305035
1988	14706.551140364933
1989	15276.837684393253
1990	14283.029443501111
1991	14589.041164319246
1992	14745.399985504682
1993	15226.69575433579
1994	15530.61482746181
1995	16514.946349955
1996	16073.555726453877
1997	16713.47396350253
1998	16835.324399697285
1999	17777.35400794233
2000	18484.07716004412
2001	18464.500880539235
2002	18368.814507604
2003	18244.201493935783
2004	20261.73137202337
2005	19917.112877331067
2006	19862.25394718865
2007	20068.009534201217
2008	19523.433129352834
2009	18900.868470252295
2010	18632.090039176037
2011	18641.636642263995
2012	19356.475624203104
2013	19639.252500924285
2014	19710.826539347374
2015	20039.548178756846
2016	20277.544222140994
2017	19879.970670384893
2018	20631.146970057314
2019	20283.465782707783
2020	20160.749756445708
2021	19102.894500928447
2022	20111.275739598623
2023	20965.56155097028