Year % 2001 9.797627606038821 2002 7.851582898617703 2003 8.927185759123496 2004 9.500896501336118 2005 7.414420229349076 2006 8.05625286006314 2007 6.331041186379656 2008 6.078789052013265 2009 5.482482001227636 2010 7.430626819128595 2011 8.519246316144487 2012 10.117575861452405 2013 12.378650247782485 2014 16.54928687017225 2015 17.71406848007745 2016 17.37476034321878 2017 13.411515514670604 2018 13.630147365931009 2019 14.411366665410405 2020 13.207517079664555 2021 19.48710476978695 2022 19.49235812790673 2023 15.277094076662712