Year	Percent
1990-01-01	2.1600000000000000
1991-01-01	2.2400000000000000
1992-01-01	2.9600000000000000
1993-01-01	3.3500000000000000
1994-01-01	3.3525000000000000
1995-01-01	2.9800000000000000
1996-01-01	2.7450000000000000
1997-01-01	3.1516700000000000
1998-01-01	4.4033300000000000
1999-01-01	4.0216699999999990
2000-01-01	4.8308300000000010
2001-01-01	5.1308300000000004
2002-01-01	5.7533300000000000
2003-01-01	6.1533300000000000
2004-01-01	5.7650000000000000
2005-01-01	4.6941700000000000
2006-01-01	3.5575000000000000
2007-01-01	3.2300000000000000
2008-01-01	3.5666700000000000
2009-01-01	4.3025000000000000
2010-01-01	5.4966700000000000
2011-01-01	5.3183300000000004
2012-01-01	5.0091700000000000
2013-01-01	4.1625000000000000
2014-01-01	4.4708300000000000
2015-01-01	4.9775000000000000
2016-01-01	5.0883300000000000