Year	Number
2007-01-01	9.3530
2008-01-01	11.2091
2009-01-01	12.6157
2010-01-01	13.4644
2011-01-01	15.1499
2012-01-01	15.7980
2013-01-01	16.4755
2014-01-01	16.8684
2015-01-01	17.1625