Year	Percent
1989-01-01	30.863300000000000
1990-01-01	14.529000000000002
1991-01-01	17.813500000000000
1992-01-01	21.716900000000000
1993-01-01	25.054000000000002
1994-01-01	30.089700000000000
1995-01-01	24.761500000000000
1996-01-01	32.271200000000000
1997-01-01	38.834100000000000
1998-01-01	36.093100000000000
1999-01-01	48.772500000000000
2000-01-01	23.254600000000000
2001-01-01	13.719000000000001
2002-01-01	10.820300000000000
2003-01-01	11.985400000000000
2004-01-01	12.699900000000000
2005-01-01	15.560000000000000
2006-01-01	16.518300000000000
2007-01-01	27.305700000000000
2008-01-01	15.013300000000000
2009-01-01	21.312800000000000
2010-01-01	17.965200000000000
2011-01-01	16.492100000000000
2012-01-01	17.853100000000000
2013-01-01	20.040700000000000
2014-01-01	17.894000000000002
2015-01-01	15.554800000000000
2016-01-01	15.353400000000000
2017-01-01	13.121800000000000