Year	Number
2004-01-01	2.1512
2005-01-01	2.2093
2006-01-01	2.2674
2007-01-01	2.2674
2008-01-01	2.3256
2009-01-01	2.3256
2010-01-01	2.3837
2011-01-01	2.7326
2012-01-01	2.7326
2013-01-01	2.6744
2014-01-01	2.6744
2015-01-01	3.1395
2016-01-01	2.9070