Year % (cumulative) 2004 30.3960094451904 2005 29.5383491516113 2006 28.5544776916504 2007 31.0692100524902 2008 30.6501502990723 2009 31.0313606262207 2010 31.9424495697021 2011 31.4403400421143 2012 32.0476417541504 2013 32.582878112793 2014 32.5899887084961 2015 33.1058616638184 2016 33.2810897827148 2017 33.855770111084 2018 34.4680099487305 2019 36.0883865356445 2020 38.0544395446777 2021 38.6464805603027 2022 39.4474792480469