Year	Number
2006-01-01	1.3426
2007-01-01	1.7253
2008-01-01	1.3984
2009-01-01	1.9043
2010-01-01	2.0301
2011-01-01	2.1158
2012-01-01	2.3713
2013-01-01	2.6230
2014-01-01	3.1133
2015-01-01	3.6659
2016-01-01	3.9422