Year	Number
2004-01-01	3.3288
2005-01-01	4.6154
2006-01-01	5.8074
2007-01-01	6.8638
2008-01-01	7.8488
2009-01-01	8.2896
2010-01-01	8.4276
2011-01-01	9.6016
2012-01-01	11.4981
2013-01-01	14.4425
2014-01-01	16.0353
2015-01-01	18.3064
2016-01-01	17.9689
2017-01-01	17.9689