Year	Percent
1977-01-01	1.277500000000000
1978-01-01	2.772800000000000
1979-01-01	4.472370000000000
1980-01-01	6.799440000000000
1981-01-01	9.056650000000000
1982-01-01	9.902160000000000
1983-01-01	10.560700000000000
1984-01-01	11.520400000000000
1985-01-01	11.937700000000000
1986-01-01	12.881600000000000
1987-01-01	11.779000000000002
1988-01-01	13.652800000000000
1989-01-01	15.486700000000000
1990-01-01	7.662100000000000
1991-01-01	3.340620000000000
1992-01-01	4.900690000000000
1993-01-01	6.490620000000000
1994-01-01	5.596030000000001
1995-01-01	4.876490000000000
1996-01-01	5.665170000000000
1997-01-01	6.517280000000000
1998-01-01	6.638570000000000
1999-01-01	6.557989999999999
2000-01-01	7.382389999999999
2001-01-01	13.591700000000000
2002-01-01	18.409800000000000
2003-01-01	16.791200000000000
2004-01-01	15.425600000000000
2005-01-01	14.245400000000000
2006-01-01	13.349800000000000
2007-01-01	11.395700000000000
2008-01-01	9.981000000000000
2009-01-01	10.258700000000000
2010-01-01	10.372900000000000
2011-01-01	8.758480000000000
2012-01-01	7.929730000000000
2013-01-01	12.920500000000000
2014-01-01	18.380800000000000
2015-01-01	17.205300000000000
2016-01-01	16.402000000000000