Year % 1995 19.35 1996 18.93 1997 18.94 1998 21.28 1999 17.03 2000 13.09 2001 13.44 2002 13.1 2004 12.94 2005 6.3 2006 4.15 2007 4.25 2008 4.25 2009 0.55 2010 0.55 2011 0.55 2012 0.52 2013 0.5 2014 0.51 2015 0.54 2016 0.52 2017 0.62 2018 0.61 2019 0.82 2020 0.82 2021 0.88