Year	Percent
1996-01-01	24.2421
1997-01-01	35.8538
1998-01-01	33.1651
1999-01-01	46.4650
2000-01-01	45.1867
2001-01-01	54.5479
2002-01-01	66.3993
2003-01-01	74.3984
2004-01-01	71.0592
2005-01-01	53.4719
2006-01-01	45.9761
2007-01-01	37.0496
2008-01-01	33.9711
2009-01-01	41.8481
2010-01-01	31.9694
2011-01-01	32.9809
2012-01-01	32.6848
2013-01-01	36.4154
2014-01-01	28.5548
2015-01-01	36.3753
2016-01-01	27.6477