Year	Number
2004-01-01	0.1465
2005-01-01	0.1465
2006-01-01	0.1709
2007-01-01	0.1913
2008-01-01	0.2442
2009-01-01	0.2930
2010-01-01	0.3296
2011-01-01	0.3744
2012-01-01	0.4232
2013-01-01	0.4517
2014-01-01	0.6227
2015-01-01	0.7122
2016-01-01	0.7651