Year	Number
2006-01-01	3.3682
2007-01-01	3.3309
2008-01-01	3.3233
2009-01-01	4.6637
2010-01-01	5.1009
2011-01-01	4.9583
2012-01-01	5.4166
2013-01-01	5.3500
2014-01-01	5.2511
2015-01-01	4.8949
2016-01-01	4.0819
2017-01-01	4.1226