Year % 2005 36.365 2006 37.009 2007 36.459 2008 36.787 2009 37.369 2010 38.588 2011 39.128 2012 39.205 2013 35.583 2014 32.028 2015 30.934 2016 31.073 2017 32.639 2018 34.381 2019 34.296 2020 34.946 2021 36.775 2022 39.39