Year	Number
2004-01-01	1.1674
2005-01-01	1.1956
2006-01-01	1.5822
2007-01-01	2.8763
2008-01-01	3.7880
2009-01-01	3.9603
2010-01-01	4.1470
2011-01-01	4.3743
2012-01-01	4.4073
2013-01-01	4.5074
2014-01-01	4.8359
2015-01-01	5.2099
2016-01-01	5.5819