Year	Number
2004-01-01	2.3940
2005-01-01	2.5636
2006-01-01	2.5137
2007-01-01	2.5935
2008-01-01	2.5337
2009-01-01	1.9850
2010-01-01	2.0449
2011-01-01	1.9152
2012-01-01	1.8753
2013-01-01	1.9551
2014-01-01	2.0449
2015-01-01	1.9352
2016-01-01	2.3741
2017-01-01	2.4339