Year	Number
2004-01-01	1.9839
2005-01-01	2.5081
2006-01-01	2.9123
2007-01-01	3.0829
2008-01-01	3.7329
2009-01-01	3.9063
2010-01-01	4.1468
2011-01-01	4.4365
2012-01-01	4.6514
2013-01-01	4.5615
2014-01-01	4.6058
2015-01-01	4.9250
2016-01-01	4.9628