Year	constant 2010 US$
1991	5636.46789073448
1992	7034.75834774471
1993	6947.98309573686
1994	7240.89041567501
1995	8036.50033134113
1996	8695.47170302407
1997	9227.94672834353
1998	8128.30763440815
1999	8896.97742243438
2000	9228.81656949926
2001	9782.31229703484
2002	9943.78131528319
2003	9999.22431125836
2004	11654.8913386756
2005	11955.7644686035
2006	12362.1839192294
2007	13282.7208137802
2008	14305.9852161082
2009	15197.2815189557
2010	15244.5592121354
2011	15192.2643775835
2012	15382.344090197
2013	16042.0301039746
2014	17383.8338796341
2015	18700.366979924
2016	19092.393772705
2017	19058.5855006927
2018	19434.2523274235