Year	Number
2004-01-01	0.035033282
2005-01-01	0.315299535
2006-01-01	0.325309044
2007-01-01	0.330313798
2008-01-01	0.365347080
2009-01-01	0.395375607
2010-01-01	0.470446925
2011-01-01	0.495470697
2012-01-01	0.470446925
2013-01-01	0.450427907
2014-01-01	0.395375607