Year	Percent
1998-01-01	50.6070
1999-01-01	45.6426
2000-01-01	36.0571
2001-01-01	34.6378
2002-01-01	41.2134
2003-01-01	24.0056
2004-01-01	21.0257
2005-01-01	60.9091
2006-01-01	46.5536
2007-01-01	57.7988
2008-01-01	60.1383
2009-01-01	62.7244
2010-01-01	64.6885
2011-01-01	50.4413
2012-01-01	57.6405
2013-01-01	49.6902
2014-01-01	59.3818