Year	constant 2010 US$
1995	21333.441695022
1996	27103.7765801605
1997	28949.5021267705
1998	29947.9408977353
1999	29988.2057524303
2000	33061.1147460154
2001	32068.257888385
2002	34045.0822220886
2003	34209.3435334992
2004	33476.1117568273
2005	30045.810201629
2006	33833.8883281394
2007	37526.8794356584
2008	41019.4597850252
2009	41420.8728009258
2010	42255.0142410759
2011	46001.3869378051
2012	42220.3557705631
2013	48281.2597303774
2014	47710.9832723871
2015	49472.6061531313
2016	50788.5947885851
2017	47595.4531067092
2018	48455.5052537843