Year % 1996 46.40423 1997 46.08327 1998 46.08327 1999 37.79956 2000 5.73586 2001 40.82383 2002 43.25178 2003 43.66929 2006 36.74839 2007 41.51089 2010 41.65051 2011 36.5635 2012 34.67704 2013 39.59883 2015 47.70982 2016 37.35849 2017 33.25953 2020 27.63927