Year	Percent
1996-01-01	33.4752
1997-01-01	33.6349
1998-01-01	29.5309
1999-01-01	28.4630
2000-01-01	38.7864
2001-01-01	37.8843
2002-01-01	31.5356
2003-01-01	34.5257
2004-01-01	28.0544
2005-01-01	33.2092
2006-01-01	31.4116
2007-01-01	33.4607
2008-01-01	28.2764
2009-01-01	24.8811
2010-01-01	24.7561
2011-01-01	17.2316
2012-01-01	25.2597
2013-01-01	26.1088
2014-01-01	28.7365
2015-01-01	26.1185
2016-01-01	30.9929