Year	Number
2007-01-01	1.2800
2008-01-01	1.3244
2009-01-01	1.7407
2010-01-01	1.9324
2011-01-01	2.6074
2012-01-01	3.0956
2013-01-01	3.5498
2014-01-01	4.0916
2015-01-01	4.7231
2016-01-01	6.0943
2017-01-01	7.8987