Year	Number
2008-01-01	27.7033
2009-01-01	27.0234
2010-01-01	26.2682
2011-01-01	25.9851
2012-01-01	24.3848
2013-01-01	23.1883
2014-01-01	22.4661
2015-01-01	20.8927
2016-01-01	20.2929
2017-01-01	19.2064