Year	Number
2004-01-01	1.0998
2005-01-01	1.5361
2006-01-01	1.8001
2007-01-01	2.0872
2008-01-01	2.5376
2009-01-01	3.2350
2010-01-01	3.4817
2011-01-01	3.7133
2012-01-01	4.0352
2013-01-01	4.6387
2014-01-01	4.2551
2015-01-01	4.4361
2016-01-01	4.3653