Year	constant 2015 US$
1970	12195.638453804931
1971	12068.389137924565
1972	12693.766262323274
1973	13500.1610149521
1974	13751.931462247656
1975	13387.33512714165
1976	12835.544457445925
1977	12379.972893546763
1978	12597.13456291664
1979	12586.99073680789
1980	12541.004621460748
1981	12748.454799348017
1982	12448.396340007448
1983	12658.822875414702
1984	13035.953691027162
1985	13132.766872545644
1986	13677.010078751491
1987	13944.6409397451
1988	14321.694973194668
1989	14406.92635755111
1990	14354.447500120457
1991	13355.994669370004
1992	13265.55080558565
1993	13593.802621808087
1994	14278.207074007763
1995	14655.077459703047
1996	15149.454797090671
1997	15361.69756832712
1998	15655.716929612823
1999	16050.385269196411
2000	16181.95217236783
2001	16521.895108404955
2002	17045.715438640924
2003	17749.74508148198
2004	18422.441884215157
2005	19055.58286884386
2006	19365.331096819158
2007	19913.589674368606
2008	19587.628374012314
2009	19689.47757945714
2010	19898.396621992248
2011	20370.322407864514
2012	20726.762157322886
2013	21353.47583458148
2014	21696.301811022415
2015	22157.522101016682
2016	23057.078554293843
2017	23669.461743421853
2018	24309.123994825528
2019	24505.442422552114
2020	23987.555233893156
2021	25316.074495712775
2022	25980.49783985127