Year	constant 2015 US$
1960	9362.511250825339
1961	9812.386149148877
1962	10080.436642895947
1963	10464.819709981923
1964	10802.405085733244
1965	11150.583933619911
1966	11254.842320873375
1967	11425.70999578927
1968	11827.511208858004
1969	12261.4584446802
1970	12572.694071765864
1971	12498.968046915703
1972	12885.806700186278
1973	13198.061835550792
1974	13607.253579517605
1975	13932.80264788263
1976	14465.28209010742
1977	14269.854302883754
1978	14128.778067933088
1979	14436.328518315559
1980	14291.79229117375
1981	14471.393630043462
1982	14594.501670215515
1983	14261.403140145676
1984	14504.417950364055
1985	14860.634970856026
1986	15535.776038377802
1987	16259.278824367844
1988	16646.91271233778
1989	16715.14231002748
1990	16476.774018900873
1991	16401.5590578709
1992	16054.350590909014
1993	15499.415932605682
1994	15666.127655660075
1995	15731.038559384117
1996	15991.275929034467
1997	16471.09752164207
1998	17011.88820603598
1999	17690.02600765518
2000	18619.285308890598
2001	18726.183102633928
2002	19087.839319495135
2003	19329.03803440081
2004	19807.03608263033
2005	20349.74918035787
2006	20841.356745838177
2007	21512.349893197097
2008	21434.783098680356
2009	21473.567745069446
2010	22178.943873542758
2011	22450.219041005483
2012	22447.741043827522
2013	22657.53049060432
2014	23079.65597332302
2015	23733.29024846857
2016	23976.207530228166
2017	24271.916249768634
2018	24435.315778163378
2019	24363.069197270095
2020	23421.476476676842
2021	24753.838437076374
2022	25157.390076025655
2023	24280.934795531703