Year	Percent
1999-01-01	3.3584600000000000
2000-01-01	3.5857800000000000
2001-01-01	3.7761300000000000
2002-01-01	3.8111000000000000
2003-01-01	5.2988900000000000
2004-01-01	6.0553200000000000
2005-01-01	6.4697900000000000
2006-01-01	6.3837500000000000
2007-01-01	8.4303700000000000
2008-01-01	5.3337900000000005
2009-01-01	6.9732600000000010
2010-01-01	7.8696500000000000
2011-01-01	5.8612199999999990
2012-01-01	6.9285900000000000
2013-01-01	6.9036899999999990
2014-01-01	7.1128399999999990
2015-01-01	6.6436699999999990
2016-01-01	6.2207500000000000