Year % 2002 12.41 2003 10.22 2004 10.33 2005 8.2 2006 8.36 2007 9.07 2008 5.83 2009 6.83 2010 6.91 2011 7.01 2012 7.69 2013 7.21 2014 7.76 2015 7.13 2016 8.93 2017 7.3 2018 7.78 2019 8.32