Year	Number
2007-01-01	4.4698
2008-01-01	4.8765
2009-01-01	5.7157
2010-01-01	6.1666
2011-01-01	6.3315
2012-01-01	5.9307
2013-01-01	8.3989
2014-01-01	10.2247
2015-01-01	17.7797
2016-01-01	20.3793