Year	Number
2004-01-01	10.8670
2005-01-01	10.9218
2006-01-01	11.2566
2007-01-01	12.3625
2008-01-01	13.2194
2009-01-01	13.7967
2010-01-01	14.1929
2011-01-01	14.1989
2012-01-01	15.0486
2013-01-01	14.9749
2014-01-01	14.8594
2015-01-01	14.1010
2016-01-01	14.1545