Year	Percent
1996-01-01	46.8323
1997-01-01	48.4660
1998-01-01	51.9073
1999-01-01	57.0332
2000-01-01	72.8928
2001-01-01	72.5672
2002-01-01	70.6871
2003-01-01	62.3160
2004-01-01	42.0082
2005-01-01	46.2027
2006-01-01	37.7183
2007-01-01	39.3764
2008-01-01	31.0793
2009-01-01	28.7886
2010-01-01	28.6147
2011-01-01	24.3834
2012-01-01	23.8051
2013-01-01	26.6656
2014-01-01	19.0186
2015-01-01	28.2715
2016-01-01	33.7395