Year	Number
2004-01-01	0.2664
2005-01-01	0.3141
2006-01-01	0.4023
2007-01-01	0.5234
2008-01-01	0.6742
2009-01-01	0.8180
2010-01-01	0.8898
2011-01-01	1.0117
2012-01-01	1.1625
2013-01-01	1.2734
2014-01-01	1.3398
2015-01-01	1.3422
2016-01-01	1.4063
2017-01-01	1.4867