Year	Number
2004-01-01	34.8560
2005-01-01	34.2602
2006-01-01	34.0616
2007-01-01	34.7567
2008-01-01	34.0616
2009-01-01	34.5084
2010-01-01	33.9126
2011-01-01	33.5154
2012-01-01	33.6643
2013-01-01	30.1390
2014-01-01	27.8550
2015-01-01	27.2592
2016-01-01	26.7627
2017-01-01	25.7200