Year	constant 2015 US$
1980	11305000
1981	13390000
1982	11895000
1983	12460000
1984	24941000
1985	28254000
1986	28350000
1987	30020000
1988	37471000
1989	37762000
1990	43850000
1991	72128000
1992	59144000
1993	79115000
1994	88706000
1995	84138000
1996	107747000
1997	145600000
1998	175486000
1999	184502000
2000	216702000
2001	253906000
2002	250809000
2003	268201000
2004	289572000
2005	302564000
2006	317721000
2007	370675000
2008	376290000
2009	382695000
2010	375251000
2011	345270000
2012	355508000
2013	365564000
2014	355209000
2015	362880000
2016	398134000