Year	constant 2015 US$
1971	1720.2418013382305
1972	1908.949005535759
1973	2034.913915659453
1974	2085.5576254532643
1975	2269.81838625271
1976	2168.8674552351026
1977	2207.9068174190843
1978	2171.7078443022565
1979	2157.142605769703
1980	2219.1817703066217
1981	2217.6779711924896
1982	2213.154073818254
1983	2191.2467855072264
1984	2023.788087514184
1985	2199.8810855282295
1986	2404.2900035217376
1987	2505.3921797864155
1988	2635.135384844177
1989	2660.448626238181
1990	2415.017779299179
1991	2548.640182176083
1992	2793.2946394971377
1993	2890.145088718657
1994	2972.261992562331
1995	3079.836639062956
1996	3232.7860791401554
1997	3519.947648647981
1998	3793.0996538609534
1999	3882.1998922655835
2000	3933.405943784395
2001	4035.3903123036453
2002	4109.089653503693
2003	3789.1118739980943
2004	3760.872163960704
2005	4135.101903545049
2006	4431.787474241514
2007	4659.490139352062
2008	4814.6530656203095
2009	4943.0377316078075
2010	5223.886450471647
2011	5212.596414573821
2012	5295.396048813081
2013	5367.971076972018
2014	5667.855410899222
2015	6231.531887458955
2016	6608.682988426005
2017	6703.844627400671
2018	7034.652137665089
2019	7309.704680161935
2020	6367.873955367901
2021	6608.40714396391