Year % 2001 3.4 2003 3.75 2004 3.26 2005 3.19 2006 2.02 2007 3.01 2008 2.22 2009 3.52 2010 3.38 2011 3.44 2012 1.95 2013 1.82 2014 1.98 2015 1.81 2016 0.89 2017 1.65 2019 4.38 2020 2.04 2021 2.97