Year Percent 1995-01-01 19.69050 1996-01-01 26.18360 1997-01-01 20.08240 1998-01-01 20.11590 1999-01-01 41.87270 2000-01-01 48.17610 2001-01-01 49.94280 2002-01-01 59.26880 2003-01-01 69.01540 2004-01-01 73.94130 2005-01-01 95.72290 2006-01-01 95.33410 2007-01-01 65.38650 2008-01-01 23.00580 2009-01-01 21.00410 2010-01-01 13.25190 2011-01-01 11.50750 2012-01-01 12.35910 2013-01-01 11.97450 2014-01-01 8.12513 2015-01-01 10.72190 2016-01-01 10.32170