Year	Number
2007-01-01	6.9814
2008-01-01	7.4791
2009-01-01	7.6002
2010-01-01	7.8827
2011-01-01	8.0307
2012-01-01	8.0576
2013-01-01	8.7167
2014-01-01	9.0395
2015-01-01	9.0934
2016-01-01	9.1875
2017-01-01	8.9185