Year	constant 2015 US$
1970	445.5085610599576
1971	471.88689426851835
1972	486.4681726755416
1973	521.5832391516265
1974	551.7327066119149
1975	559.5030044539229
1976	588.9663006786127
1977	635.0027214758977
1978	677.5877470704672
1979	682.097654399699
1980	837.9148338868536
1981	954.5013593201862
1982	998.730764441277
1983	3188.519488830239
1984	4571.4745361320365
1985	6305.215010189691
1986	5959.634985585158
1987	4914.690360024032
1988	1902.6672800190286
1989	2120.7521153504804
1990	3295.419991401859
1991	2588.2410222850062
1992	2889.409418897083
1993	3999.564934159334
1994	5110.484707792278
1995	5296.765307876793
1996	3093.573422125549
1997	2701.3018713993974
1998	185.0804384786314
1999	-488.7287324859316
2000	-1338.881820552835
2001	-1734.550151979515
2002	502.29832588610424
2003	-1739.171424396901
2004	-201.4779788032859
2005	-665.9761189463949
2006	-318.5689052727481
2007	1740.3814695007793
2008	1692.43954436915
2009	2072.0290025403706
2010	2094.3206311187737
2011	2175.353348401801
2012	2267.1532023282225
2013	2367.814078847487
2014	2431.3078054320604
2015	2561.2085312613044
2016	2717.6495392802076
2017	2794.5191356210016
2018	2869.8241064414083
2019	2928.734095722666
2020	2824.63316582372
2021	2955.6229498809757