Year	Percent
1989-01-01	4.0000
1990-01-01	4.0000
1991-01-01	2.0000
1992-01-01	2.0000
1993-01-01	2.0000
1994-01-01	2.0000
1995-01-01	17.0000
1996-01-01	7.0000
1997-01-01	14.7500
1998-01-01	17.2917
1999-01-01	13.3333
2000-01-01	18.2500
2001-01-01	22.0000
2002-01-01	22.4167
2003-01-01	20.1000
2004-01-01	18.2800
2005-01-01	18.9603
2006-01-01	18.5500
2007-01-01	19.6500
2008-01-01	19.6500
2009-01-01	19.1875
2010-01-01	17.7600
2011-01-01	14.5925
2012-01-01	13.2781
2013-01-01	13.3286
2014-01-01	14.2508
2015-01-01	16.4092
2016-01-01	15.4508