Year % 1995 0 2000 2.94 2001 3.59 2002 7.17 2003 2.9 2006 1.41 2007 1.43 2008 2.81 2009 2.68 2010 3.43 2011 3.58 2012 3.62 2013 3.62 2014 3.38 2015 4.14 2016 3.91 2017 3.52 2018 3.32 2019 2.91 2020 2.71 2021 3.45