Year	Number
2004-01-01	0.5087
2005-01-01	0.5168
2006-01-01	0.5209
2007-01-01	0.5209
2008-01-01	0.6023
2009-01-01	0.6064
2010-01-01	0.6511
2011-01-01	1.6238
2012-01-01	1.7011
2013-01-01	1.8883
2014-01-01	1.0825
2015-01-01	0.9157
2016-01-01	0.9604