Year	Percent
1988-01-01	0.9120860000000001
1989-01-01	0.5630020000000000
1990-01-01	0.4099000000000000
1991-01-01	0.4536900000000000
1992-01-01	0.5891529999999999
1993-01-01	0.6332300000000001
1994-01-01	0.7073530000000000
1995-01-01	0.7218790000000000
1996-01-01	0.7395910000000000
1997-01-01	0.7447380000000000
1998-01-01	1.9408500000000000
1999-01-01	2.6795100000000000
2000-01-01	2.1668400000000000
2001-01-01	2.5563800000000000
2002-01-01	4.2399500000000000
2003-01-01	4.8545000000000000
2004-01-01	5.2153199999999990
2005-01-01	3.3911000000000000
2006-01-01	4.3119300000000000
2007-01-01	6.1826000000000000
2008-01-01	5.7202699999999990
2009-01-01	5.9083800000000000
2010-01-01	5.3948400000000000
2011-01-01	4.7399300000000000
2012-01-01	4.6101900000000000
2013-01-01	6.0994699999999990
2014-01-01	8.7725300000000000
2015-01-01	8.1076699999999990
2016-01-01	4.7896000000000000
2017-01-01	7.6883899999999990