Year % 1995 25.55 1996 22.16 1997 23.33 1998 23.49 1999 21.44 2000 18.03 2001 20.67 2002 19.56 2004 18.92 2005 8.99 2006 6.13 2007 6.14 2008 6.13 2009 1.19 2010 1.17 2011 0.56 2012 1.1 2013 1.12 2014 0.96 2015 1.07 2016 1.05 2017 1.34 2018 1.11 2019 1.32 2020 1.32 2021 1.34