Year	Number
2004-01-01	4.9041
2005-01-01	6.2409
2006-01-01	6.9405
2007-01-01	7.3897
2008-01-01	8.1735
2009-01-01	8.1042
2010-01-01	6.7939
2011-01-01	7.1631
2012-01-01	7.0681
2013-01-01	7.4164
2014-01-01	7.6108
2015-01-01	8.1310
2016-01-01	11.1181
2017-01-01	11.4180