Year	Number
2008-01-01	0.1522
2009-01-01	0.1618
2010-01-01	0.1901
2011-01-01	0.2285
2012-01-01	0.2746
2013-01-01	0.2753
2014-01-01	0.2752
2015-01-01	0.2366
2016-01-01	0.1891