Year % (cumulative) 2004 28.2774696350098 2005 28.0391902923584 2006 27.0274906158447 2007 27.3266696929932 2008 28.5938091278076 2009 29.4880504608154 2010 29.6306304931641 2011 29.8836193084717 2012 30.2779598236084 2013 30.4366607666016 2014 30.4937591552734 2015 30.8774299621582 2016 31.4717807769775 2017 31.5132579803467 2018 30.0940208435059 2019 32.4130058288574 2020 33.3553886413574 2021 34.2396087646484 2022 34.1160011291504