Year % 2000 24.532 2001 28.383 2002 27.972 2003 27.327 2004 26.911 2005 30.242 2006 31.133 2007 33.581 2008 31.899 2009 34.57 2010 34.767 2011 30.452 2012 31.669 2013 30.754 2014 31.296 2015 31.038 2016 31.983 2017 32.936 2018 32.87 2019 35.067 2020 36.515 2021 34.446 2022 35.263