Year % 2003 31.626 2006 35.312 2008 41.6 2009 38.324 2010 37.886 2011 37.919 2012 38.684 2013 37.291 2014 34.165 2015 37.774 2016 36.712 2017 40.007 2018 35.907 2019 41.802 2020 46.425 2021 42.385 2022 38.892