Year	Number
2004-01-01	1.1641
2005-01-01	1.2950
2006-01-01	1.2167
2007-01-01	1.5079
2008-01-01	1.6775
2009-01-01	1.8340
2010-01-01	1.9423
2011-01-01	2.1144
2012-01-01	2.1601
2013-01-01	2.3402
2014-01-01	2.7785
2015-01-01	2.9117
2016-01-01	2.8871