Year	Number
2008-01-01	3.9991
2009-01-01	4.0604
2010-01-01	4.0892
2011-01-01	4.4561
2012-01-01	4.6192
2013-01-01	4.8869
2014-01-01	4.9653
2015-01-01	5.2357
2016-01-01	5.2609
2017-01-01	5.1798