Year	constant 2015 US$
1961	2211.4916666729114
1962	2346.9769384598058
1963	2489.5259637992403
1964	2646.1284081652143
1965	2913.453375606934
1966	3239.1234649302655
1967	3202.7940009216127
1968	3449.7502250166012
1969	3687.7907545126864
1970	3978.0039452379174
1971	4394.062099785429
1972	4637.845972831501
1973	5103.156412921801
1974	4855.341824392769
1975	4940.994435722019
1976	5247.110235217867
1977	6036.594714540969
1978	6940.689330166987
1979	7192.59843458709
1980	7855.534855639763
1981	8256.643836245852
1982	8554.85560465521
1983	9076.646163971274
1984	9513.901674243516
1985	9821.76087115199
1986	10532.111762111736
1987	11536.805784364175
1988	12512.253783081209
1989	12857.243849991462
1990	13618.515466714027
1991	14756.485896880733
1992	15888.891930536092
1993	16843.768839111355
1994	17538.911651249302
1995	17475.148364536613
1996	17339.136468084464
1997	18147.973922549318
1998	17007.914652023264
1999	17022.360203815417
2000	17634.913099711444
2001	17750.562907758842
2002	17487.21658235006
2003	17248.92154061662
2004	18334.728152379103
2005	18901.692130214906
2006	19925.463874950186
2007	21463.350913825772
2008	21740.594718101107
2009	21732.702951886477
2010	22892.72885179493
2011	24647.73210304639
2012	25377.279747865043
2013	26443.18964316312
2014	27135.08015964978
2015	28186.15647522056
2016	28573.661555521307
2017	29913.78974119663
2018	31245.399486522092
2019	30767.939177475422
2020	27605.701891859153
2021	29410.913827785393
2022	29024.80518554786
2023	30671.908984677517