Year Percent 1995-01-01 0.07145100000000000 1996-01-01 0.40221599999999996 1997-01-01 2.29247000000000020 1998-01-01 3.51168000000000000 1999-01-01 1.97934000000000000 2000-01-01 4.11862000000000000 2001-01-01 8.65077000000000000 2002-01-01 10.67660000000000000 2003-01-01 14.98380000000000000 2004-01-01 17.22660000000000000 2005-01-01 17.87310000000000000 2006-01-01 36.93150000000000000 2007-01-01 71.95970000000000000 2008-01-01 76.13800000000000000 2009-01-01 59.98530000000000000 2010-01-01 34.36920000000000000 2011-01-01 26.65890000000000000 2012-01-01 19.84860000000000000 2013-01-01 12.43720000000000000 2014-01-01 8.62875000000000000 2015-01-01 8.14956999999999900 2016-01-01 9.61430000000000000 2017-01-01 9.74353000000000000