Year	Number
2004-01-01	0.9213
2005-01-01	0.8892
2006-01-01	0.7376
2007-01-01	0.7574
2008-01-01	0.7806
2009-01-01	0.7990
2010-01-01	0.8297
2011-01-01	0.9215
2012-01-01	1.0365
2013-01-01	1.5496
2014-01-01	1.9462
2015-01-01	1.9554
2016-01-01	2.0059