Year	Percent
1990-01-01	2.8217600000000000
1991-01-01	2.8867300000000000
1992-01-01	2.9134700000000002
1993-01-01	2.8456700000000000
1994-01-01	2.9412400000000000
1995-01-01	2.8693500000000000
1996-01-01	3.0104700000000000
1997-01-01	3.1523500000000000
1998-01-01	3.5634200000000000
1999-01-01	4.3047200000000000
2000-01-01	5.3226600000000000
2001-01-01	4.9031699999999990
2002-01-01	4.3902500000000000
2003-01-01	4.0862300000000005
2004-01-01	3.8992600000000000
2005-01-01	4.4253000000000000
2006-01-01	4.6142100000000000
2007-01-01	4.9120800000000004
2008-01-01	5.0304699999999990
2009-01-01	5.8799000000000000
2010-01-01	6.0166400000000000
2011-01-01	5.7355500000000000
2012-01-01	5.0117199999999995
2013-01-01	5.3309500000000000
2014-01-01	4.9719200000000000
2015-01-01	5.3091900000000000
2016-01-01	6.4609900000000000