Year	Number
2004-01-01	56.8495
2005-01-01	59.7774
2006-01-01	60.8664
2007-01-01	59.9404
2008-01-01	59.9431
2009-01-01	59.1981
2010-01-01	59.4578
2011-01-01	66.9690
2012-01-01	67.9264
2013-01-01	62.1887
2014-01-01	61.2411
2015-01-01	58.6227
2016-01-01	56.8864