Year	Percent
1999-01-01	46.0590104075160
2000-01-01	45.7974148004520
2001-01-01	46.0317986758459
2002-01-01	46.5157438417484
2003-01-01	46.1844506516707
2004-01-01	46.0058394886835
2005-01-01	46.5721055048539
2006-01-01	47.0350490445995
2007-01-01	47.6913963201429
2008-01-01	47.9996775468539
2009-01-01	46.9986641162211
2010-01-01	46.4307955724682
2011-01-01	46.4212808640643
2012-01-01	46.5065936493058
2013-01-01	46.9271389352592