Year	Number
2004-01-01	38.9898
2005-01-01	39.4324
2006-01-01	37.4878
2007-01-01	38.5771
2008-01-01	40.1417
2009-01-01	40.2042
2010-01-01	39.5247
2011-01-01	41.5310
2012-01-01	38.0462
2013-01-01	38.1726
2014-01-01	37.7619
2015-01-01	38.4172
2016-01-01	35.8297
2017-01-01	34.4928