Year % 2005 46.33845 2006 46.54277 2007 46.83506 2008 46.83506 2009 47.39524 2010 44.44983 2011 44.35204 2012 43.6633 2013 43.80984 2015 43.47313 2019 42.43577 2020 39.17789 2021 38.90273