Year Percent 1994-01-01 6.0917100000000000 1995-01-01 4.8426000000000000 1996-01-01 5.5797300000000005 1997-01-01 8.5138000000000000 1998-01-01 12.7123000000000000 1999-01-01 14.4822000000000000 2000-01-01 13.7676000000000000 2001-01-01 17.8052000000000000 2002-01-01 18.7813000000000000 2003-01-01 24.2364000000000000 2004-01-01 30.2162000000000000 2005-01-01 26.5740000000000000 2006-01-01 28.3186000000000000 2007-01-01 35.9514000000000000 2008-01-01 35.0457000000000000 2009-01-01 61.2889999999999940 2010-01-01 65.4649000000000000 2011-01-01 72.7627000000000000 2012-01-01 43.7227000000000000 2013-01-01 29.9869000000000000 2014-01-01 38.8563000000000000 2015-01-01 45.0914000000000000 2016-01-01 44.9166000000000000