Year	Percent
1996-01-01	87.8761
1997-01-01	77.5956
1998-01-01	78.0822
1999-01-01	86.6667
2000-01-01	57.2979
2001-01-01	42.0168
2002-01-01	40.7733
2003-01-01	45.0237
2004-01-01	49.0331
2005-01-01	48.0334
2006-01-01	51.4339
2007-01-01	45.4392
2008-01-01	38.9977
2009-01-01	40.4521
2010-01-01	38.7387
2011-01-01	39.5373
2012-01-01	34.5816
2013-01-01	29.2763
2014-01-01	30.6353