Year	Percent
1998-01-01	5.900000000000000
1999-01-01	6.000000000000000
2000-01-01	5.800000000000000
2001-01-01	5.500000000000000
2002-01-01	5.600000000000000
2003-01-01	5.800000000000000
2004-01-01	6.100000000000000
2005-01-01	6.200000000000000
2006-01-01	6.600000000000000
2007-01-01	6.500000000000000
2008-01-01	5.800000000000000
2009-01-01	6.500000000000000
2010-01-01	6.696820000000000
2011-01-01	5.327020000000000
2012-01-01	6.700889999999999
2013-01-01	6.920889999999999
2014-01-01	7.660400000000000
2015-01-01	8.440910000000000
2016-01-01	8.420650000000000