Year	Number
2004-01-01	0.6561
2005-01-01	0.9078
2006-01-01	0.8958
2007-01-01	0.7262
2008-01-01	0.6825
2009-01-01	0.6310
2010-01-01	0.6376
2011-01-01	0.8363
2012-01-01	0.8698
2013-01-01	1.3309
2014-01-01	1.9280
2015-01-01	3.4322
2016-01-01	4.4263