Year	constant 2010 US$
1991	3676.90615817997
1992	3855.94667855789
1993	4297.74653256182
1994	4401.38383119986
1995	4470.27706538288
1996	4573.30121552448
1997	4733.61345575077
1998	4704.61341654623
1999	4933.1896134169
2000	5250.86035232013
2001	5595.24258924098
2002	6001.78762284686
2003	6326.34638380341
2004	6499.98500935113
2005	6916.07879010258
2006	7346.97826705868
2007	7994.16517538635
2008	8491.48610949335
2009	8845.4236482622
2010	9183.60713960967
2011	9629.79237224015
2012	10089.2380966794
2013	10433.2835194052
2014	10791.2202034496
2015	11298.0789996379
2016	11813.4845993613
2017	12406.071849696
2018	13133.160411045