Year % 2000 35.245 2001 39.894 2002 38.659 2003 40.803 2004 39.72 2005 42.764 2006 41.787 2007 40.26 2008 42.221 2009 40.972 2010 40.705 2011 30.424 2012 30.601 2013 30.49 2014 31.617 2015 30.885 2016 32.369 2017 31.902 2018 33.528 2019 31.262 2020 32.252 2021 34.156 2022 35.127