Year % 2005 9.53246716521554 2006 9.26293927147304 2007 8.75316997417969 2008 10.5973316686301 2009 12.1575133261736 2010 12.3928800027842 2011 12.5473272680795 2012 12.1090481980515 2013 12.2089558587239 2014 10.3178985462767 2015 6.90972750498834 2016 6.07601156561548 2017 6.49197722014219 2018 6.02743159490985 2019 6.93971027112341 2020 7.18655634764637 2021 6.88784549572173 2022 5.82142596969134