Year	Number
2007-01-01	6.3470
2008-01-01	7.2170
2009-01-01	7.8657
2010-01-01	8.7387
2011-01-01	7.5074
2012-01-01	12.4091
2013-01-01	13.9044
2014-01-01	15.0331
2015-01-01	16.8650
2016-01-01	21.4856
2017-01-01	23.8174