Year	Number
2004-01-01	0.1524
2005-01-01	0.1546
2006-01-01	0.1502
2007-01-01	0.1546
2008-01-01	0.1546
2009-01-01	0.1502
2010-01-01	0.1590
2011-01-01	0.1744
2012-01-01	0.1789
2013-01-01	0.1833
2014-01-01	0.1833
2015-01-01	0.2937