Year	Percent
1999-01-01	32.142200000000000
2000-01-01	36.692700000000000
2001-01-01	30.096200000000000
2002-01-01	23.001300000000000
2003-01-01	26.563100000000000
2004-01-01	27.956999999999997
2005-01-01	31.332200000000000
2006-01-01	42.596800000000000
2007-01-01	39.819100000000000
2008-01-01	21.371600000000000
2009-01-01	30.656000000000000
2010-01-01	29.243400000000000
2011-01-01	22.626700000000000
2012-01-01	30.245000000000000
2013-01-01	35.932800000000000
2014-01-01	31.663100000000000
2015-01-01	35.071100000000000
2016-01-01	35.314100000000000