Year	Number
2006-01-01	13.0692
2007-01-01	15.9387
2008-01-01	18.3354
2009-01-01	20.5030
2010-01-01	22.8901
2011-01-01	25.7930
2012-01-01	27.3416
2013-01-01	29.3011
2014-01-01	31.5498
2015-01-01	32.5902
2016-01-01	29.6868