Year % 2001 2.25 2004 17.36 2005 17.42 2006 16.33 2007 13.94 2008 12.38 2009 10.8 2010 10.75 2011 13.73 2012 13.77 2013 2.37 2014 4.04 2015 4.55 2016 3.18 2017 1.98 2018 4.46 2019 4.46 2020 4.46 2021 4.46