Year	Percent
1990-01-01	18.690700000000000
1991-01-01	18.860200000000000
1992-01-01	27.243700000000000
1993-01-01	36.723800000000000
1994-01-01	37.973600000000000
1995-01-01	43.993200000000000
1996-01-01	44.228900000000000
1997-01-01	44.691800000000000
1998-01-01	46.968400000000000
1999-01-01	43.479600000000000
2000-01-01	36.911300000000000
2001-01-01	41.307100000000000
2002-01-01	38.608000000000004
2003-01-01	42.546200000000000
2004-01-01	43.466100000000000
2005-01-01	47.396900000000000
2006-01-01	47.539800000000000
2007-01-01	47.804600000000000
2008-01-01	46.532100000000000
2009-01-01	46.778700000000000
2010-01-01	46.274300000000000
2011-01-01	46.589200000000000
2012-01-01	44.903200000000000
2013-01-01	45.238000000000000
2014-01-01	46.591900000000000
2015-01-01	50.323300000000000
2016-01-01	51.836400000000000