Year	constant 2015 US$
1990	382300000
1991	491000000
1992	669060000
1993	425150000
1994	383100000
1995	390680000
1996	536120000
1997	370840000
1998	639050000
1999	798280000
2000	773330000
2001	728300000
2002	653980000
2003	410340000
2004	429350000
2005	444010000
2006	515170000
2007	407880000
2008	554110000
2009	607050000
2010	623630000
2011	670980000
2012	707300000
2013	703110000
2014	1235990000
2015	1443880000
2016	1523320000
2017	1133700000