Year	Number
2004-01-01	2.2348
2005-01-01	2.4388
2006-01-01	2.3590
2007-01-01	1.8003
2008-01-01	3.2902
2009-01-01	4.0440
2010-01-01	4.6736
2011-01-01	4.3721
2012-01-01	4.2391
2013-01-01	4.2923
2014-01-01	5.4275