Year	Number
2004-01-01	3.8009
2005-01-01	3.9298
2006-01-01	4.1915
2007-01-01	4.6223
2008-01-01	4.7632
2009-01-01	4.8599
2010-01-01	5.1135
2011-01-01	5.3873
2012-01-01	5.6128
2013-01-01	5.3068
2014-01-01	5.2464
2015-01-01	5.3310
2016-01-01	5.1860