Year	Number
2004-01-01	0.0312
2005-01-01	0.0825
2006-01-01	0.0731
2007-01-01	0.0703
2008-01-01	0.0723
2009-01-01	0.0798
2010-01-01	0.0857
2011-01-01	0.1891
2012-01-01	0.5077
2013-01-01	0.0160
2014-01-01	0.0155
2015-01-01	0.0144
2016-01-01	0.0167
2017-01-01	0.0191