Year	Number
2008-01-01	3.8303
2009-01-01	3.9221
2010-01-01	4.0683
2011-01-01	4.3889
2012-01-01	4.5401
2013-01-01	4.6372
2014-01-01	4.6431
2015-01-01	4.3416
2016-01-01	4.5502
2017-01-01	4.7213