Year	constant 2015 US$
1991	6197.023064177165
1992	6042.783280731762
1993	6138.735718048697
1994	5774.232999388126
1995	5932.625660471071
1996	6101.493599605562
1997	6291.328196839888
1998	6294.281262701453
1999	6253.5321292960025
2000	6569.35623493478
2001	6881.78254902767
2002	7421.177961075881
2003	7313.958916046003
2004	8477.945165594574
2005	8375.841077173438
2006	8668.353580033327
2007	8945.222986720297
2008	9738.012968699877
2009	10118.617808743189
2010	9811.928700898248
2011	10409.336936384643
2012	10173.578714617483
2013	10740.298322076878
2014	11648.949751266608
2015	11858.08592164807
2016	12038.255534946025
2017	12569.569700085995
2018	12866.71584238902
2019	13347.709395790402
2020	13617.161745493577
2021	13660.958722863334
2022	14447.611053590168