Year % 2004 3.41 2008 6.96 2010 7.86 2011 7.42 2012 7.32 2013 7.15 2014 6.13 2015 6.67 2016 4.93 2017 4.69 2018 4.65 2019 11.22 2020 4.33 2021 4.53