Year % 2001 0.7906246762129464 2002 0.8235796374326065 2003 0.78040578403555 2004 0.6954914393758274 2005 0.6718923315489201 2006 0.6257047020070291 2007 0.6179437775506987 2008 5.97461598703357 2009 7.001171831809491 2010 7.145696377538764 2011 11.23227376853155 2012 10.605302075031892 2013 15.727977041326488 2014 16.57760984409568 2015 14.014165688912186 2016 12.37077229627527 2017 12.691560158698206 2018 9.687218337508135 2019 9.1346166258151 2020 15.39760304691032 2021 22.26420465092818 2022 18.987849943725603 2023 16.421164355857833