Year	Number
2008-01-01	20.3607
2009-01-01	25.1448
2010-01-01	29.7025
2011-01-01	29.9721
2012-01-01	33.1571
2013-01-01	33.3146
2014-01-01	31.5627
2015-01-01	30.7450
2016-01-01	25.5313
2017-01-01	25.5313