Year	Percent
1984-01-01	39.964600000000000
1985-01-01	42.878000000000000
1986-01-01	50.351000000000006
1987-01-01	51.801100000000000
1988-01-01	58.034700000000000
1989-01-01	59.627200000000000
1990-01-01	60.623900000000000
1991-01-01	60.670800000000000
1992-01-01	55.846800000000000
1993-01-01	53.656700000000000
1994-01-01	51.009100000000000
1995-01-01	52.479200000000000
1996-01-01	51.210800000000000
1997-01-01	46.662000000000000
1998-01-01	47.288600000000000
1999-01-01	44.132200000000000
2000-01-01	43.698900000000000
2001-01-01	44.211000000000006
2002-01-01	48.059300000000000
2003-01-01	54.176500000000000
2004-01-01	59.885400000000000
2005-01-01	63.551700000000000
2006-01-01	65.226200000000000
2007-01-01	64.641800000000000
2008-01-01	66.377000000000000
2009-01-01	74.348300000000000
2010-01-01	80.628400000000000
2011-01-01	74.176100000000000
2012-01-01	70.837200000000000
2013-01-01	74.034100000000000
2014-01-01	71.264900000000000
2015-01-01	72.962700000000000
2016-01-01	77.687200000000000