Year	Number
2004-01-01	1.2555
2005-01-01	1.9108
2006-01-01	2.0073
2007-01-01	1.6627
2008-01-01	2.2051
2009-01-01	2.6478
2010-01-01	2.9000
2011-01-01	3.0888
2012-01-01	3.0451
2013-01-01	3.1473
2014-01-01	3.4400
2015-01-01	3.3658
2016-01-01	3.3237