Year	Percent
1996-01-01	37.1398
1997-01-01	29.1132
1998-01-01	31.6315
1999-01-01	31.5001
2000-01-01	26.9841
2001-01-01	31.1744
2002-01-01	21.5316
2003-01-01	17.9582
2004-01-01	39.8074
2005-01-01	41.6802
2006-01-01	41.4232
2007-01-01	36.7253
2008-01-01	35.5534
2009-01-01	30.3676
2010-01-01	30.9233
2011-01-01	36.9978
2012-01-01	32.5466
2013-01-01	30.3366
2014-01-01	26.7107
2015-01-01	27.8843
2016-01-01	29.4529