Year	Number
2004-01-01	11.2885
2005-01-01	14.2677
2006-01-01	15.5485
2007-01-01	16.2991
2008-01-01	16.5749
2009-01-01	19.0850
2010-01-01	26.7454
2011-01-01	30.5399
2012-01-01	32.7954
2013-01-01	24.7109
2014-01-01	28.7330
2015-01-01	28.0110