Year % 1995 2.53 1996 8.62 1997 8.62 1998 8.62 1999 5.64 2001 10.61 2002 10.59 2003 11.2 2004 11.2 2005 10.62 2006 10.69 2007 10.77 2008 10.77 2009 10.7 2010 10.7 2011 10.36 2012 9.89 2013 9.89 2014 9.89 2015 10.26 2016 10.26 2017 9.12 2018 8.82 2019 12.05 2020 10.99 2021 10.04