Year Percent 1996-01-01 0.8536040000000001 1997-01-01 1.0507500000000000 1998-01-01 4.8984200000000000 1999-01-01 5.1327900000000000 2000-01-01 5.0984600000000000 2001-01-01 2.9889099999999997 2002-01-01 8.0240800000000000 2003-01-01 3.4671199999999995 2004-01-01 4.1604600000000000 2005-01-01 3.4028199999999997 2006-01-01 16.0484000000000000 2007-01-01 13.8976000000000000 2008-01-01 18.7261000000000000 2009-01-01 17.9327000000000000 2010-01-01 16.0042000000000000 2011-01-01 16.3037000000000000 2012-01-01 14.2262000000000000 2013-01-01 11.7070000000000000 2014-01-01 11.6177000000000000 2015-01-01 11.4801000000000000 2016-01-01 11.8780000000000000