Year	Number
2004-01-01	0.008
2005-01-01	0.008
2006-01-01	0.013
2007-01-01	0.018
2008-01-01	0.031
2009-01-01	0.046
2010-01-01	0.145
2011-01-01	0.160
2012-01-01	0.241