Year	Percent
1997-01-01	4.1597000000000000
1998-01-01	4.1271100000000000
1999-01-01	3.2957800000000000
2000-01-01	2.3374400000000000
2001-01-01	1.4447299999999998
2002-01-01	2.9998900000000000
2003-01-01	2.6966799999999997
2004-01-01	2.2300800000000000
2005-01-01	2.9771099999999997
2006-01-01	2.3060600000000000
2007-01-01	1.9482099999999998
2008-01-01	1.7337900000000002
2009-01-01	2.2666800000000000
2010-01-01	2.0053300000000000
2011-01-01	2.8924300000000000
2012-01-01	4.6867000000000000
2013-01-01	5.1385800000000000
2014-01-01	4.7878000000000000
2015-01-01	7.4216399999999990
2016-01-01	6.8302200000000000