Year % (cumulative) 2006 30.4582042694092 2007 31.3452777862549 2008 30.8053436279297 2009 31.6854591369629 2010 33.5963706970215 2011 34.309398651123 2012 36.5952301025391 2015 38.7680282592773 2016 39.5638847351074 2018 39.7399597167969 2019 41.0556945800781