Year	Percent
1996-01-01	46.6667
1997-01-01	42.2680
1998-01-01	43.2258
1999-01-01	51.0057
2000-01-01	45.7988
2001-01-01	49.8355
2002-01-01	49.0294
2003-01-01	47.0755
2004-01-01	48.2963
2005-01-01	33.2401
2006-01-01	32.9717
2007-01-01	28.3726
2008-01-01	36.3031
2009-01-01	32.2927
2010-01-01	29.6510
2011-01-01	21.2274
2012-01-01	23.2397
2013-01-01	23.9895
2014-01-01	20.5571
2015-01-01	21.8865
2016-01-01	17.5423