Year	Number
2004-01-01	8.3259
2005-01-01	14.8244
2006-01-01	12.8262
2007-01-01	14.2422
2008-01-01	16.2356
2009-01-01	18.1986
2010-01-01	19.6125
2011-01-01	21.2917
2012-01-01	22.8186
2013-01-01	24.1656
2014-01-01	25.1613
2015-01-01	25.9325
2016-01-01	26.6965
2017-01-01	27.4010