Year	Number
2004-01-01	1.8648
2005-01-01	2.0519
2006-01-01	2.4300
2007-01-01	2.3250
2008-01-01	2.3363
2009-01-01	2.1915
2010-01-01	2.2836
2011-01-01	2.2344
2012-01-01	2.0238
2013-01-01	1.8263
2014-01-01	1.8132
2015-01-01	0.9872
2016-01-01	0.8227
2017-01-01	0.2172