Year	Percent
1999-01-01	55.7447446291473
2000-01-01	55.4806541940134
2001-01-01	55.6320859855509
2002-01-01	55.1354317943134
2003-01-01	54.9796121249189
2004-01-01	55.0102759408343
2005-01-01	55.0248515336600
2006-01-01	55.7867727779422
2007-01-01	55.4327185011534
2008-01-01	55.8478102585408
2009-01-01	53.1942257136350
2010-01-01	51.5070146036413
2011-01-01	51.5170387841636
2012-01-01	51.0094125083247
2013-01-01	50.6907150187937
2014-01-01	51.2026478221447