Year	Percent
1996-01-01	36.0463
1997-01-01	30.2717
1998-01-01	26.9549
1999-01-01	21.3398
2000-01-01	19.1145
2001-01-01	20.6270
2002-01-01	23.6707
2003-01-01	24.1269
2004-01-01	23.3948
2005-01-01	22.7908
2006-01-01	25.1475
2007-01-01	23.0412
2008-01-01	28.5191
2009-01-01	39.5546
2010-01-01	36.2408
2011-01-01	35.6657
2012-01-01	29.0318
2013-01-01	29.2848
2014-01-01	31.2443
2015-01-01	26.7105
2016-01-01	27.4267