Year	Percent
1990-01-01	1.7813299999999999
1991-01-01	1.9455700000000000
1992-01-01	2.0738000000000000
1993-01-01	2.1448800000000000
1994-01-01	2.2253000000000000
1995-01-01	2.4922600000000000
1996-01-01	2.7287400000000000
1997-01-01	2.9982800000000000
1998-01-01	2.6854900000000000
1999-01-01	2.4848500000000000
2000-01-01	2.1148200000000000
2001-01-01	2.6339500000000000
2002-01-01	2.6101799999999997
2003-01-01	2.5508200000000000
2004-01-01	2.5593800000000000
2005-01-01	2.6847700000000000
2006-01-01	2.9296000000000000
2007-01-01	3.1175200000000003
2008-01-01	3.2482700000000000
2009-01-01	3.6536900000000000
2010-01-01	3.9717300000000004
2011-01-01	4.4299300000000010
2012-01-01	4.8040100000000000
2013-01-01	3.6380800000000004
2014-01-01	4.9917400000000000
2015-01-01	4.9730500000000000
2016-01-01	4.7474900000000000