Year	current US$
1995	182000000
1996	168000000
1997	156000000
1998	158000000
1999	195000000
2000	183000000
2001	256000000
2002	234000000
2003	239000000
2004	275000000
2005	346000000
2007	328000000
2008	490000000
2009	476000000
2010	560000000
2011	658000000
2012	441000000
2013	404000000
2014	509000000
2015	346000000