Year	Number
2008-01-01	22.0578
2009-01-01	20.9724
2010-01-01	21.7979
2011-01-01	23.7753
2012-01-01	31.4245
2013-01-01	27.4444
2014-01-01	27.8767
2015-01-01	30.1210
2016-01-01	33.9497