Year	Percent
1996-01-01	40.2632
1997-01-01	44.2396
1998-01-01	45.0734
1999-01-01	45.5508
2000-01-01	44.4668
2001-01-01	45.3586
2002-01-01	47.4138
2003-01-01	46.9345
2004-01-01	47.6079
2005-01-01	41.0382
2006-01-01	40.0117
2007-01-01	42.9611
2008-01-01	48.4214
2009-01-01	46.2205
2010-01-01	43.4560
2011-01-01	43.0073
2012-01-01	49.7502
2013-01-01	41.6216
2014-01-01	39.0885