Year	constant 2011 international $
1990	3360.80870885828
1991	3288.06504317905
1992	3354.67540552724
1993	3205.15490283902
1994	3069.48660758442
1995	2991.82707384606
1996	3040.73091250735
1997	3053.10161713464
1998	3054.84798283445
1999	2996.93630774793
2000	3069.43645211614
2001	3170.43835243065
2002	3565.39478392626
2003	3731.4632512152
2004	3973.62027846187
2005	4121.50348353358
2006	4258.59364094947
2007	4421.36008068081
2008	4596.9992316965
2009	4835.94937614404
2010	5085.41401259899
2011	5213.83719396966
2012	5290.63010562191
2013	5494.51673446098
2014	5687.59204396668
2015	5685.92583949693
2016	5448.91286698061
2017	5351.44125410472
2018	5315.82318053519