Year	Number
2004-01-01	0.3782
2005-01-01	0.4359
2006-01-01	0.5577
2007-01-01	0.6538
2008-01-01	0.6603
2009-01-01	0.8141
2010-01-01	0.8526
2011-01-01	0.8974
2012-01-01	1.0321
2013-01-01	1.0705
2014-01-01	1.1987
2015-01-01	1.2179
2016-01-01	1.3013