Year	Number
2004-01-01	4.0167
2009-01-01	4.4852
2010-01-01	5.0623
2011-01-01	5.9422
2012-01-01	6.4564
2013-01-01	6.8392
2014-01-01	7.9534
2015-01-01	8.4276
2016-01-01	12.7071
2017-01-01	13.2099