Year	constant 2015 US$
1980	3563.279242812444
1981	3556.3550528042256
1982	3478.3441308143074
1983	3323.8006557736917
1984	3225.6595310390217
1985	3147.809821351349
1986	3196.4871666665363
1987	3203.7420924105872
1988	3116.1067155108817
1989	2976.5931492916725
1990	2857.9472241611816
1991	2989.5415022417346
1992	3103.4701951279008
1993	2957.0465177099304
1994	2914.360640443651
1995	2939.491249633517
1996	2951.135735092679
1997	2997.249904599494
1998	3019.735948109221
1999	3047.186285170456
2000	3082.7592074117983
2001	3056.4676831540664
2002	3148.3527749675995
2003	3235.746736988552
2004	3587.8387252055913
2005	3634.6203258863256
2006	3845.2883740964253
2007	4001.7089882570353
2008	4053.219998899681
2009	4007.485265682249
2010	4186.042146864018
2011	4330.944029485984
2012	4476.414353338734
2013	4648.317151081536
2014	4846.889511715273
2015	4965.672765065511
2016	4880.445037546731
2017	4746.183329341517
2018	4714.452518245651
2019	4596.61957617524
2020	4152.180647834803
2021	4232.018936394068
2022	4394.3970993933945
2023	4511.889396583451