Year	Percent
1999-01-01	25.67240000000000
2000-01-01	25.04820000000000
2001-01-01	23.81090000000000
2002-01-01	25.35050000000000
2003-01-01	26.08880000000000
2004-01-01	30.66150000000000
2005-01-01	29.23130000000000
2006-01-01	38.88680000000000
2007-01-01	39.60410000000000
2008-01-01	31.82520000000000
2009-01-01	35.74330000000000
2010-01-01	32.88000000000000
2011-01-01	30.57900000000000
2012-01-01	40.42440000000000
2013-01-01	42.54600000000001
2014-01-01	37.89640000000000
2015-01-01	35.35790000000000
2016-01-01	30.82020000000000