Year	Number
2007-01-01	21.8306
2008-01-01	26.3754
2009-01-01	29.9314
2010-01-01	32.2118
2011-01-01	36.5811
2012-01-01	38.5106
2013-01-01	40.5677
2014-01-01	42.0188
2015-01-01	43.2786