Year % 1996 6.44 1997 7.01 2000 5.83 2001 6.01 2002 6.9 2008 0.88 2009 0.86 2010 1.53 2011 1.19 2012 1.32 2013 1.47 2014 1.39 2015 1.21 2016 1.16 2017 0.95 2018 0.94 2019 3.37 2020 0.98 2021 2.38