Year current US$ 1995 58000000 1996 72000000 1997 78000000 1998 52000000 1999 53000000 2000 50000000 2001 38000000 2002 60000000 2003 51900001.5258789 2004 71199996.9482422 2005 55599998.4741211 2006 16000000 2007 21000000 2008 29000000 2009 113000000 2010 119000000 2011 161000000 2012 155000000 2013 153000000 2014 125000000 2015 125000000 2016 119599998.47412099 2017 154600006.10351598 2018 113000000