Year	Percent
1989-01-01	7.133310000000001
1990-01-01	6.182180000000001
1991-01-01	8.078380000000001
1992-01-01	11.436500000000000
1993-01-01	10.298000000000000
1994-01-01	18.942900000000000
1995-01-01	8.036170000000000
1996-01-01	7.986950000000000
1997-01-01	10.357300000000000
1998-01-01	10.056800000000000
1999-01-01	6.162510000000000
2000-01-01	4.022710000000000
2001-01-01	3.205480000000000
2002-01-01	2.470740000000000
2003-01-01	3.556000000000000
2004-01-01	7.114610000000001
2005-01-01	19.146300000000000
2006-01-01	29.319800000000000
2007-01-01	20.680500000000000
2008-01-01	18.104100000000000
2009-01-01	17.887600000000000
2010-01-01	12.275800000000000
2011-01-01	12.408300000000000
2012-01-01	13.655600000000000
2013-01-01	8.921990000000000
2014-01-01	10.161600000000000
2015-01-01	11.903400000000000
2016-01-01	15.468500000000000
2017-01-01	12.005100000000000