Year	Number
2004-01-01	7.6580
2005-01-01	9.1450
2006-01-01	9.9628
2007-01-01	12.7138
2008-01-01	15.3903
2009-01-01	16.1338
2010-01-01	14.7955
2011-01-01	15.0186
2012-01-01	15.1673
2013-01-01	15.9108
2014-01-01	15.7621
2015-01-01	16.2082
2016-01-01	16.7286
2017-01-01	16.5056