Year	Percent
1985-01-01	43.94430000000000
1986-01-01	50.48880000000000
1987-01-01	56.57570000000000
1988-01-01	57.27990000000000
1989-01-01	62.55350000000000
1990-01-01	71.11470000000000
1991-01-01	64.42020000000000
1992-01-01	55.57690000000000
1993-01-01	37.19900000000000
1994-01-01	16.06760000000000
1995-01-01	17.52640000000000
1996-01-01	25.70190000000000
1997-01-01	39.81670000000000
1998-01-01	50.19590000000000
1999-01-01	51.82580000000000
2000-01-01	58.82230000000000
2001-01-01	77.79840000000000
2002-01-01	93.64800000000000
2003-01-01	96.58740000000000
2004-01-01	98.19280000000000
2005-01-01	99.36060000000000
2006-01-01	99.88180000000000
2007-01-01	99.88180000000000
2008-01-01	99.92280000000000
2009-01-01	99.86390000000000
2010-01-01	99.84100000000001
2011-01-01	99.83050000000000
2012-01-01	99.76210000000000
2013-01-01	99.69650000000000
2014-01-01	83.08880000000000
2015-01-01	70.42300000000000
2016-01-01	67.50970000000000