Year	Number
2008-01-01	36.7697
2009-01-01	36.2281
2010-01-01	35.4381
2011-01-01	35.2374
2012-01-01	33.1630
2013-01-01	31.6132
2014-01-01	30.7157
2015-01-01	28.6804
2016-01-01	27.9784
2017-01-01	26.4803