Year % 1995 4.41 1997 5.39 2002 6.49 2006 4.51 2007 6.77 2008 5.61 2009 2.52 2010 3.28 2011 2.63 2012 2.8 2013 3.58 2014 2.71 2015 2.63 2016 3.25 2017 2.35 2018 1.97 2019 1.82 2020 1.94 2021 1.92