Year	Number
2008-01-01	0.4289
2009-01-01	0.8102
2010-01-01	1.4991
2011-01-01	1.9151
2012-01-01	2.3354
2013-01-01	3.3102
2014-01-01	3.7478
2015-01-01	4.4541
2016-01-01	4.7444
2017-01-01	5.2036