Year % 2001 12.121801891987722 2002 14.818094498795128 2003 19.01613222588384 2004 22.958166614748595 2005 26.031305462063276 2006 30.0316339730611 2007 28.964606649813184 2008 26.064371518651207 2009 23.310512935050156 2010 20.629688403675836 2011 22.406455500425132 2012 19.357321754918875 2013 16.52757893870924 2014 13.008151331843035 2015 10.855033414263692 2016 10.179761575903107 2017 9.79454007135362 2018 9.270517525686289 2019 8.772931188285707 2020 7.071183042916437 2021 7.679371602405329 2022 8.8544874142189 2023 7.574126937274736