Year	constant 2015 US$
1968	2214.798852114511
1969	2281.8652221072384
1970	2354.6533212816635
1971	2440.59265324372
1972	2567.4676480754533
1973	2684.5932929333694
1974	2792.6743542584227
1975	2769.6899594854062
1976	2840.336708419338
1977	2913.5522586189927
1978	3095.4027272292155
1979	3202.8683946240903
1980	3267.5361528362896
1981	3247.257813555391
1982	3166.992237736627
1983	3123.3960685212396
1984	3123.5400836049325
1985	3129.7762999978127
1986	3229.7874869670854
1987	3321.970526806458
1988	3421.2274772649353
1989	3415.7742942631744
1990	3528.710798138307
1991	3546.0885330599604
1992	3632.123101476474
1993	3786.582633244592
1994	3968.2048730703455
1995	4100.274328494934
1996	4092.568171486941
1997	4155.330795001219
1998	4127.273396415485
1999	3893.416623800838
2000	3921.360645261428
2001	3914.3265474982477
2002	3942.9766511442153
2003	4008.728380108212
2004	4158.86890277182
2005	4339.683047633041
2006	4566.210766261258
2007	4792.207012076905
2008	4868.762178492328
2009	4893.121100501627
2010	5025.781508127091
2011	5269.302289889485
2012	5441.7275020322995
2013	5687.01494004802
2014	5927.77365305066
2015	6147.4778682261895
2016	6221.899749875899
2017	6172.426659604914
2018	6161.391201312179
2019	6261.88541181206
2020	5802.571553589924
2021	6313.038786814032
2022	6681.808296630284
2023	6807.4395368393225