Year	Number
2008-01-01	4.77860552376421
2009-01-01	4.58154218439646
2010-01-01	4.97572774704373
2011-01-01	6.08681147797848
2012-01-01	7.15208062175139
2013-01-01	8.69327433226080
2014-01-01	11.46694164904630
2015-01-01	11.25615088798430