Year	Number
2004-01-01	1.1074
2005-01-01	1.2539
2006-01-01	1.3240
2007-01-01	1.3951
2008-01-01	1.5083
2009-01-01	1.5887
2010-01-01	1.6698
2011-01-01	1.6835
2012-01-01	1.3935
2013-01-01	1.1661
2014-01-01	1.1614
2015-01-01	1.0923
2016-01-01	1.0538
2017-01-01	1.0538