Year	Number
2004-01-01	57.5565
2005-01-01	56.7988
2006-01-01	56.1074
2007-01-01	55.4616
2008-01-01	59.8436
2009-01-01	59.1921
2010-01-01	58.5489
2011-01-01	48.2644
2012-01-01	50.1139
2013-01-01	49.5692
2014-01-01	44.3726
2015-01-01	43.9239
2016-01-01	41.2075
2017-01-01	32.0503