Year	Number
2004-01-01	0.2989
2005-01-01	0.2932
2006-01-01	0.2888
2007-01-01	0.4875
2008-01-01	0.5202
2009-01-01	0.7504
2010-01-01	0.8596
2011-01-01	0.8985
2012-01-01	0.9397
2013-01-01	1.0206