Year	Percent
1999-01-01	24.4835
2000-01-01	21.3699
2001-01-01	23.6659
2002-01-01	20.6027
2003-01-01	25.8490
2004-01-01	22.3541
2005-01-01	24.8245
2006-01-01	32.2879
2007-01-01	34.4095
2008-01-01	16.7108
2009-01-01	34.2542
2010-01-01	32.2781
2011-01-01	22.6865
2012-01-01	25.5151
2013-01-01	25.7261
2014-01-01	25.8642
2015-01-01	27.3435
2016-01-01	30.1498