Year % 2004 1.91 2008 4.75 2010 7.17 2011 7.61 2012 7.88 2013 7.3 2014 6.58 2015 5.62 2016 5.39 2017 5.15 2018 5.01 2019 6.87 2020 4.32 2021 4.89