Year % 2000 29.039438614982775 2001 28.69420084220778 2002 28.47327075096239 2003 28.243011503681178 2004 27.763269143428474 2005 27.470348756122032 2006 26.965318200675274 2007 26.71362246137816 2008 26.638266275714432 2009 26.418946241090282 2010 26.286148821040833 2011 25.964784654699628 2012 25.605981509644483 2013 24.96058685271052 2014 24.503052530715987 2015 24.369265674709435 2016 24.228686789668593 2017 23.768528063322357 2018 23.498151721547696 2019 23.266100657404007