Year	Number
2004-01-01	9.6768
2005-01-01	11.6961
2006-01-01	13.8239
2007-01-01	18.6014
2008-01-01	23.4987
2009-01-01	24.0059
2010-01-01	24.1304
2011-01-01	24.0938
2012-01-01	24.0173
2013-01-01	23.4091
2014-01-01	21.9419
2015-01-01	21.8514
2016-01-01	21.5096