Year % 1995 3.36 1997 3.93 2002 3.99 2006 3.05 2007 4.69 2008 3.85 2009 1.93 2010 2.9 2011 1.9 2012 2.05 2013 2.78 2014 2.06 2015 1.93 2016 2.46 2017 1.9 2018 1.56 2019 5.33 2020 1.67 2021 1.71