Year Percent 1995-01-01 0.30649099999999996 1996-01-01 0.25294800000000000 1997-01-01 0.22224200000000000 1998-01-01 4.67074000000000000 1999-01-01 6.98105000000000000 2000-01-01 9.18750000000000000 2001-01-01 8.97578000000000000 2002-01-01 7.87540000000000000 2003-01-01 6.39730000000000000 2004-01-01 7.09318000000000000 2005-01-01 3.57449000000000000 2006-01-01 5.73154000000000000 2007-01-01 6.61926000000000100 2008-01-01 5.00388000000000050 2009-01-01 8.89031000000000100 2010-01-01 9.64763999999999900 2011-01-01 11.40880000000000000 2012-01-01 16.03990000000000000 2013-01-01 18.26050000000000000 2014-01-01 14.62160000000000000 2015-01-01 13.85490000000000000 2016-01-01 11.42860000000000000