Year % 2001 2.6 2002 8.78 2004 10.45 2005 9.44 2006 8.67 2007 8.32 2008 5.95 2009 9.53 2010 5.05 2011 9.03 2012 5.47 2013 0.52 2014 0.58 2015 0.99 2016 1.18 2017 0.66 2018 1.48 2019 2.38 2020 2.27 2021 2.14