Year	Number
2004-01-01	0.3826
2005-01-01	0.3775
2006-01-01	0.3927
2007-01-01	0.4279
2008-01-01	0.5814
2009-01-01	0.7350
2010-01-01	0.9036
2011-01-01	1.0244
2012-01-01	1.1024
2013-01-01	1.1603
2014-01-01	1.0446
2015-01-01	1.1855
2016-01-01	1.2056