Year Percent 1993-01-01 0.7994330000000000 1994-01-01 2.3071599999999997 1995-01-01 2.5317100000000000 1996-01-01 2.1916900000000004 1997-01-01 3.4839000000000000 1998-01-01 3.1628600000000000 1999-01-01 3.2240300000000000 2000-01-01 2.6785500000000000 2001-01-01 2.9229800000000000 2002-01-01 3.0621400000000003 2003-01-01 4.7721300000000010 2004-01-01 6.2513100000000000 2005-01-01 13.9715000000000000 2006-01-01 20.9850000000000000 2007-01-01 32.0512000000000000 2008-01-01 25.5021000000000000 2009-01-01 30.2224000000000000 2010-01-01 30.0325000000000000 2011-01-01 21.0921000000000000 2012-01-01 17.9850000000000000 2013-01-01 15.3835000000000000 2014-01-01 12.6238000000000000 2015-01-01 15.4125000000000000 2016-01-01 10.8146000000000000