Year	Number
2004-01-01	2.0549
2005-01-01	1.9850
2006-01-01	1.8354
2007-01-01	1.7855
2008-01-01	1.7357
2009-01-01	1.5262
2010-01-01	1.4464
2011-01-01	1.3167
2012-01-01	1.1970
2013-01-01	1.1072
2014-01-01	1.0474
2015-01-01	0.9576
2016-01-01	0.9476
2017-01-01	0.9476