Year current US$ 2002 104000000 2003 128000000 2004 167000000 2005 122000000 2006 129000000 2007 149000000 2008 168000000 2009 170000000 2010 179000000 2011 176000000 2012 159000000 2013 164000000 2014 169000000 2015 145000000 2016 153000000