Year	Number
2004-01-01	34.4615
2005-01-01	34.1798
2006-01-01	35.8513
2007-01-01	35.8560
2008-01-01	36.1454
2009-01-01	36.2161
2010-01-01	36.0644
2011-01-01	36.6079
2012-01-01	36.2874
2013-01-01	36.7947
2014-01-01	37.5491
2015-01-01	37.8093
2016-01-01	37.4680