Year % net 2000 47.93307 2001 49.39867 2002 53.2061 2005 57.372 2006 56.26755 2007 56.40539 2008 57.25487 2009 58.78916 2010 61.23691 2011 63.49826 2012 65.32173 2013 67.03843 2014 66.52072 2015 65.16322 2016 63.97324 2017 60.18056 2018 61.83092