Year	Number
2004-01-01	0.2489
2005-01-01	0.2692
2006-01-01	0.2946
2007-01-01	0.3251
2008-01-01	0.3454
2009-01-01	0.3556
2010-01-01	0.3759
2011-01-01	0.3962
2012-01-01	0.4267
2013-01-01	0.4267
2014-01-01	0.4420
2015-01-01	0.4623
2016-01-01	0.5283
2017-01-01	0.5690