Year	Number
2004-01-01	0.0163
2005-01-01	0.0488
2006-01-01	0.0529
2007-01-01	0.0692
2008-01-01	0.0977
2009-01-01	0.1221
2010-01-01	0.1709
2011-01-01	0.2320
2012-01-01	0.2889
2013-01-01	0.3622
2014-01-01	0.4639
2015-01-01	0.5860
2016-01-01	0.6511