Year Percent 2005 1.23 2006 0.99 2007 0.95 2008 1.22 2009 0.85 2010 1.77 2011 1.6 2012 1.27 2013 1.12 2014 1.81 2015 1.72 2016 3.1 2017 2.2 2018 2.55 2019 0.98 2020 6.48