Year	Number
2004-01-01	1.9809
2005-01-01	2.1081
2006-01-01	2.2557
2007-01-01	2.5050
2008-01-01	2.6440
2009-01-01	2.5740
2010-01-01	2.6017
2011-01-01	2.7212
2012-01-01	2.8250
2013-01-01	2.8355
2014-01-01	2.7172
2015-01-01	2.4082
2016-01-01	2.1970