Year % 1993 0 1994 0 1995 0 1996 0 1997 0 1998 0 1999 0 2000 0 2001 0 2002 0 2003 0 2004 0 2005 0 2006 0 2007 0 2008 0 2009 0 2010 0 2011 0 2012 0 2014 0 2015 0.0174616 2016 0.0156967 2017 0.0110999 2018 0.0108685 2019 0.0108617 2020 0.015373 2021 0.0117621