Year % 2005 47.80384 2006 47.77924 2007 47.15447 2008 47.15447 2009 47.53731 2010 44.27614 2011 43.72358 2012 43.08327 2013 43.6345 2015 43.31712 2019 42.54279 2020 37.83506 2021 37.90128