Year	Number
2004-01-01	0.3848
2005-01-01	0.3706
2006-01-01	0.3582
2007-01-01	0.3643
2008-01-01	0.4925
2009-01-01	0.5601
2010-01-01	0.6217
2011-01-01	0.6790
2012-01-01	0.6547
2013-01-01	0.8509
2014-01-01	0.9752
2015-01-01	0.9940
2016-01-01	1.0126
2017-01-01	1.0389