Year	Number
2006-01-01	24.5783
2007-01-01	24.6693
2008-01-01	24.6128
2009-01-01	24.1864
2010-01-01	24.0506
2011-01-01	24.1750
2012-01-01	24.2737
2013-01-01	24.1349
2014-01-01	23.9293
2015-01-01	23.6249
2016-01-01	22.9870
2017-01-01	21.7145