Year	Number
2004-01-01	8.0915
2005-01-01	7.8285
2006-01-01	7.9240
2007-01-01	7.9919
2008-01-01	8.0143
2009-01-01	8.3036
2010-01-01	8.3712
2011-01-01	8.3042
2012-01-01	8.2045
2013-01-01	8.2172
2014-01-01	8.5611
2015-01-01	8.6157
2016-01-01	8.5795