Year	Number
2004-01-01	16.7872
2005-01-01	17.7854
2006-01-01	25.7478
2007-01-01	30.0861
2008-01-01	32.5653
2009-01-01	38.7618
2010-01-01	44.9955
2011-01-01	50.3194
2012-01-01	58.2208
2013-01-01	60.7513
2014-01-01	68.0794
2015-01-01	65.1132
2016-01-01	64.5914