Year	Number
2004-01-01	1.8512
2005-01-01	1.8512
2006-01-01	1.9426
2007-01-01	1.9712
2008-01-01	1.9998
2009-01-01	1.9883
2010-01-01	2.0283
2011-01-01	2.0341
2012-01-01	1.9255
2013-01-01	1.9141
2014-01-01	1.8684
2015-01-01	1.8455
2016-01-01	1.7712
2017-01-01	1.7084