Year	Number
2004-01-01	0.4034
2005-01-01	0.5054
2006-01-01	0.4754
2007-01-01	0.6627
2008-01-01	0.8103
2009-01-01	0.7948
2010-01-01	0.9369
2011-01-01	1.0804
2012-01-01	1.2791
2013-01-01	1.4607
2014-01-01	1.4688
2015-01-01	1.6047
2016-01-01	1.6231