Year	Number
2004-01-01	2.1110
2005-01-01	2.0551
2006-01-01	2.4018
2007-01-01	2.3396
2008-01-01	3.0391
2009-01-01	3.5162
2010-01-01	4.3274
2011-01-01	4.9165
2012-01-01	5.1322
2013-01-01	4.8357
2014-01-01	5.3653
2015-01-01	6.0263
2016-01-01	5.8928