Year	Number
2004-01-01	1.1566
2005-01-01	1.0219
2006-01-01	0.9907
2007-01-01	0.9602
2008-01-01	0.9302
2009-01-01	0.9003
2010-01-01	0.9562
2011-01-01	0.9249
2012-01-01	0.8699
2013-01-01	0.8609
2014-01-01	0.8092
2015-01-01	0.7916