Year	Percent
1990-01-01	2.4532300000000000
1991-01-01	2.5673500000000000
1992-01-01	2.7180800000000000
1993-01-01	3.1882800000000000
1994-01-01	3.0001700000000002
1995-01-01	3.1201700000000000
1996-01-01	3.5077300000000005
1997-01-01	3.7050000000000000
1998-01-01	4.5573800000000000
1999-01-01	4.5282400000000000
2000-01-01	4.6742099999999995
2001-01-01	4.9367700000000000
2002-01-01	5.2099199999999990
2003-01-01	5.5494600000000000
2004-01-01	5.8794100000000000
2005-01-01	6.3112900000000005
2006-01-01	6.5144800000000010
2007-01-01	5.8525000000000000
2008-01-01	6.2380600000000000
2009-01-01	6.2498400000000000
2010-01-01	6.4639700000000000
2011-01-01	6.7619800000000000
2012-01-01	6.9268000000000000
2013-01-01	7.0563699999999990
2014-01-01	7.2999600000000004
2015-01-01	7.4308600000000010
2016-01-01	7.3278399999999990