Year	Percent
1998-01-01	7.0799500000000000
1999-01-01	6.7235800000000000
2000-01-01	6.1920900000000000
2001-01-01	6.9450899999999995
2002-01-01	7.1132200000000000
2003-01-01	7.1747399999999990
2004-01-01	6.7058100000000005
2005-01-01	9.3773500000000000
2006-01-01	13.1707000000000000
2007-01-01	17.6272000000000000
2008-01-01	13.2288000000000000
2009-01-01	8.0025600000000000
2010-01-01	9.2861600000000000
2011-01-01	10.3091000000000000
2012-01-01	10.5918000000000000
2013-01-01	10.9185000000000000
2014-01-01	12.1270000000000000
2015-01-01	14.8164000000000000
2016-01-01	15.0216000000000000