Year % 2005 12.5167631727899 2006 11.5566191061502 2007 10.5022074700388 2008 10.2320820975202 2009 11.1698082045543 2010 10.6958384111031 2011 9.60034455188952 2012 9.06831165790461 2013 8.48632692614998 2014 7.76515306540234 2015 7.45627705916539 2016 7.0175977722394 2017 6.60665710643843 2018 6.10691833969552 2019 5.60936382915275 2020 5.193220791087 2021 4.85796763215591 2022 4.63306721882146 2023 5.44084059566623