Year	constant 2015 US$
1990	2545000
1991	10117000
1992	5864000
1993	9206000
1994	8314000
1997	10116000
1998	8860000
1999	9235000
2000	10994000
2001	14163000
2002	16301000
2003	18983000
2004	20384000
2005	22857000
2006	35700000
2007	36483000
2008	46372000
2009	40521000
2010	31809000
2011	26084000
2012	27818000
2013	35640000
2014	34983000
2015	39860000
2016	52031000