Year	Number
2004-01-01	0.0312
2005-01-01	0.0825
2006-01-01	0.1169
2007-01-01	0.1222
2008-01-01	0.1371
2009-01-01	0.1631
2010-01-01	0.1620
2011-01-01	0.1891
2012-01-01	0.5154
2013-01-01	0.0160
2014-01-01	0.0155
2015-01-01	0.0153
2016-01-01	0.0167
2017-01-01	0.0290