Year % 2000 31.35 2001 27.671 2002 29.32 2003 33.978 2004 35.346 2005 34.065 2006 36.064 2007 37.124 2008 36.204 2009 36.035 2010 37.461 2011 35.915 2012 35.043 2013 35.454 2014 36.359 2015 37.429 2016 38.126 2017 38.188 2018 39.52 2019 41.151 2020 41.441 2021 39.613 2022 39.766