Year Percent 1995-01-01 2.698220000000000 1996-01-01 3.078640000000000 1997-01-01 6.605169999999999 1998-01-01 14.454500000000000 1999-01-01 20.873300000000000 2000-01-01 30.241600000000000 2001-01-01 42.825400000000000 2002-01-01 70.634600000000000 2003-01-01 72.273500000000000 2004-01-01 86.065500000000000 2005-01-01 82.331500000000000 2006-01-01 96.518300000000000 2007-01-01 85.697700000000000 2008-01-01 72.861800000000000 2009-01-01 57.230900000000000 2010-01-01 55.333600000000000 2011-01-01 65.221300000000000 2012-01-01 70.186200000000000 2013-01-01 73.348300000000000 2014-01-01 73.124100000000000 2015-01-01 75.454800000000000 2016-01-01 74.582000000000000