Year	Number
2004-01-01	0.1835
2005-01-01	0.1793
2006-01-01	0.1785
2007-01-01	0.1827
2008-01-01	0.1873
2009-01-01	0.2020
2010-01-01	0.2424
2011-01-01	0.2572
2012-01-01	0.2677
2013-01-01	0.2849
2014-01-01	0.2992
2015-01-01	0.3199