Year % 1999 8.86 2000 16.99 2001 10.16 2002 23.79 2004 9.5 2005 11.18 2006 9.54 2007 11.16 2014 9.49 2015 9.59 2016 9.63 2017 9.73 2018 10.01 2019 10.01 2020 10.12