Year	Number
2004-01-01	0.0519
2005-01-01	0.0497
2006-01-01	0.0476
2007-01-01	0.0457
2008-01-01	0.0659
2009-01-01	0.2750
2010-01-01	0.5100
2011-01-01	0.6940
2012-01-01	0.9642
2013-01-01	1.5195
2014-01-01	1.4782
2015-01-01	1.4020
2016-01-01	1.3962