Year	Number
2004-01-01	0.0847
2005-01-01	0.0941
2006-01-01	0.1695
2007-01-01	0.1869
2008-01-01	0.2488
2009-01-01	0.2636
2010-01-01	0.2676
2011-01-01	0.2744
2012-01-01	0.2771
2013-01-01	0.2784
2014-01-01	0.2717
2015-01-01	0.2676
2016-01-01	0.2676