Year	Percent
1999-01-01	40.416200000000000
2000-01-01	48.700000000000000
2001-01-01	34.900000000000000
2002-01-01	29.766100000000000
2003-01-01	18.916000000000000
2004-01-01	20.593900000000000
2005-01-01	30.644400000000000
2006-01-01	27.782400000000000
2007-01-01	29.618900000000000
2008-01-01	22.256700000000000
2009-01-01	21.977600000000000
2010-01-01	16.464100000000000
2011-01-01	6.687810000000001
2012-01-01	39.848700000000000
2013-01-01	32.100100000000000
2014-01-01	40.803200000000000
2015-01-01	38.178300000000000
2016-01-01	37.271100000000000