Year	current US$
1988	3778.01977539063
1989	3429.64990234375
1990	3494.06323242188
1991	3490.45239257813
1992	3098.802734375
1993	2930.67016601563
1994	2662.10400390625
1995	2665.77978515625
1996	2643.92919921875
1997	2737.57202148438
1998	1834.86181640625
1999	1330.75720214844
2000	1771.59411621094
2001	2100.3525390625
2002	2377.52954101563
2003	2975.123046875
2004	4102.36474609375
2005	5323.455078125
2006	6920.19970703125
2007	9101.2392578125
2008	11635.2841796875
2009	8562.82421875
2010	10674.990234375
2011	14305.33203125
2012	15401.8515625
2013	15941.4482421875
2014	14055.47265625
2015	9277.7138671875
2016	8663.158203125
2017	10658.9130859375
2018	11211.8876953125
2019	11447.701171875
2020	10108.3271484375
2021	12521.5224609375
2022	15445.2421875
2023	13817.0458984375