Year	Number
2004-01-01	2.4435
2005-01-01	2.4849
2006-01-01	2.6426
2007-01-01	2.9792
2008-01-01	2.8612
2009-01-01	3.2165
2010-01-01	3.6495
2011-01-01	4.2569
2012-01-01	4.8157
2013-01-01	5.0464
2014-01-01	5.6295
2015-01-01	6.0469
2016-01-01	6.0725