Year	Number
2009-01-01	21.2958
2010-01-01	21.1609
2011-01-01	21.0472
2012-01-01	20.9262
2013-01-01	20.8017
2014-01-01	20.6845
2015-01-01	20.5796
2016-01-01	14.4224
2017-01-01	14.4224