Year current international $ 2000 0 2001 0 2002 0 2003 0 2004 2 2005 1 2006 2 2007 3 2008 3 2009 4 2010 4 2011 3 2012 4 2013 5 2014 7 2015 13 2016 10 2017 14 2018 8 2019 6