Year % 1995 79.94769 1998 75.50877 1999 59.79494 2000 59.16394 2001 50.65518 2002 49.86515 2003 48.57101 2004 46.69701 2005 37.94614 2006 38.37321 2007 45.56602 2008 43.58191 2009 36.49995 2010 36.28931 2011 34.85855 2012 34.56385 2013 36.79063 2014 39.60079 2015 39.46377 2016 40.89725 2018 40.23217 2019 38.9494 2020 36.51236 2021 36.91963