Year current international $ 2000 3 2001 4 2002 4 2003 4 2004 4 2005 4 2006 2 2007 1 2008 1 2009 1 2010 1 2011 1 2012 1 2013 1 2014 1 2015 1 2016 1 2017 1 2018 1 2019 2 2020 2 2021 1