Year % 2002 5.07 2003 3.33 2004 3.33 2005 2.75 2006 2.14 2007 2.08 2008 2.95 2009 1.69 2010 3.24 2011 3.24 2012 3.37 2013 3.16 2014 2.14 2015 1.94 2016 1.94 2017 9.46 2018 11.39 2019 9.97 2020 1.98 2021 1.92