Year	Percent
1980-01-01	52.421200000000000
1981-01-01	60.191800000000000
1982-01-01	69.455200000000000
1983-01-01	69.455200000000000
1984-01-01	69.455200000000000
1985-01-01	69.455200000000000
1986-01-01	61.739300000000000
1987-01-01	55.541700000000000
1988-01-01	52.923600000000000
1989-01-01	49.676200000000000
1990-01-01	42.538300000000000
1991-01-01	37.849800000000000
1992-01-01	34.297400000000000
1993-01-01	31.076900000000000
1994-01-01	26.063400000000000
1995-01-01	23.152900000000000
1996-01-01	22.095000000000000
1997-01-01	16.712200000000000
1998-01-01	14.477200000000000
1999-01-01	12.776700000000000
2000-01-01	8.240420000000000
2001-01-01	7.982920000000000
2002-01-01	7.943310000000000
2003-01-01	8.541490000000000
2004-01-01	9.214660000000000
2005-01-01	9.695260000000001
2006-01-01	9.040650000000000
2007-01-01	10.251000000000000
2008-01-01	10.045000000000000
2009-01-01	9.403280000000000
2010-01-01	9.013290000000000
2011-01-01	9.534050000000000
2012-01-01	8.637480000000000
2013-01-01	8.518200000000000
2014-01-01	8.672670000000000
2015-01-01	9.022639999999999
2016-01-01	9.433750000000000