Year	Number
2007-01-01	7.0662
2008-01-01	7.7639
2009-01-01	8.3389
2010-01-01	10.3614
2011-01-01	9.8143
2012-01-01	11.0689
2013-01-01	12.3290
2014-01-01	13.0005
2015-01-01	13.3547
2016-01-01	13.7242
2017-01-01	14.1586