Year	Percent
1987-01-01	8.0747600000000010
1988-01-01	12.9829000000000000
1989-01-01	17.4968000000000000
1990-01-01	17.4968000000000000
1991-01-01	17.4968000000000000
1992-01-01	17.4968000000000000
1993-01-01	17.4968000000000000
1994-01-01	17.4968000000000000
1995-01-01	66.4462000000000000
1996-01-01	48.5033000000000000
1997-01-01	47.3838000000000000
1998-01-01	52.3645000000000000
1999-01-01	44.3003000000000000
2000-01-01	31.3535000000000000
2001-01-01	31.7912000000000000
2002-01-01	28.0276000000000000
2003-01-01	21.3810000000000000
2004-01-01	15.7000000000000000
2005-01-01	10.4400000000000000
2006-01-01	7.3467600000000010
2007-01-01	5.8677300000000000
2008-01-01	5.0388500000000000
2009-01-01	6.3013800000000000
2010-01-01	5.7748300000000010
2011-01-01	4.4388700000000000
2012-01-01	3.4570300000000005
2013-01-01	3.0418200000000000
2014-01-01	3.3760600000000000
2015-01-01	4.6032199999999990
2016-01-01	9.8550100000000000