Year	constant 2015 US$
1983	7106.272851066971
1984	5264.444475543831
1985	6908.057548078873
1986	7740.8834683988425
1987	7535.014351264628
1988	7194.544370935398
1989	6196.301369670209
1990	6127.7681835082685
1991	6975.864778175967
1992	7858.963859623427
1993	8164.635313904112
1994	8446.9858156174
1995	7947.293189506119
1996	8382.872232696562
1997	8895.742055602399
1998	9064.618950116233
1999	8454.770219825044
2000	8280.124048065905
2001	7803.195788711472
2002	6867.531580864213
2003	7588.2514752132165
2004	7447.59627179793
2005	7910.915641748348
2006	9453.69656807542
2007	10487.088838104713
2008	10971.165411541488
2009	10045.435286327262
2010	11179.983882636845
2011	12026.5155703912
2012	11726.532164551527
2013	11845.05979085664
2014	11294.492684422074
2015	11761.78123047834
2016	11413.778571291139
2017	11944.899559811814
2018	11161.212935442625
2019	10487.895711027226
2020	9572.71168285151
2021	10733.668271674574