Year	Number
2007-01-01	21.4337
2008-01-01	22.4782
2009-01-01	22.3612
2010-01-01	22.7004
2011-01-01	22.6505
2012-01-01	22.2557
2013-01-01	23.5779
2014-01-01	23.9508
2015-01-01	23.6084
2016-01-01	23.3963
2017-01-01	22.7112