Year	Percent
1999-01-01	3.8858900000000003
2000-01-01	4.0343599999999995
2001-01-01	3.5045699999999997
2002-01-01	2.3536500000000000
2003-01-01	2.2255500000000000
2004-01-01	2.2591300000000000
2005-01-01	4.7268500000000000
2006-01-01	4.7739500000000000
2007-01-01	4.8892300000000000
2008-01-01	4.9813900000000000
2009-01-01	5.2708200000000000
2010-01-01	5.3695500000000000
2011-01-01	4.9304900000000000
2012-01-01	4.9479700000000000
2013-01-01	4.8588900000000000
2014-01-01	4.1965500000000000
2015-01-01	4.0295500000000000
2016-01-01	4.0814699999999995