Year	Number
2004-01-01	0.6156
2005-01-01	0.6445
2006-01-01	0.6805
2007-01-01	0.7930
2008-01-01	1.0383
2009-01-01	1.0695
2010-01-01	1.1000
2011-01-01	1.1563
2012-01-01	1.2742
2013-01-01	1.3188
2014-01-01	1.3914
2015-01-01	1.4367
2016-01-01	1.4297
2017-01-01	1.3773