Year	Number
2004-01-01	0.0392
2005-01-01	0.2291
2006-01-01	0.2229
2007-01-01	0.2896
2008-01-01	0.3885
2009-01-01	0.8091
2010-01-01	1.4076
2011-01-01	2.7257
2012-01-01	4.6333
2013-01-01	5.1459
2014-01-01	5.5193
2015-01-01	5.5195
2016-01-01	5.6382
2017-01-01	5.7228