Year	Number
2004-01-01	1.8100
2005-01-01	2.2380
2006-01-01	3.3805
2007-01-01	3.8797
2008-01-01	4.6700
2009-01-01	5.2380
2010-01-01	7.4468
2011-01-01	8.4091
2012-01-01	9.0679
2013-01-01	10.1750
2014-01-01	10.2033
2015-01-01	10.4388
2016-01-01	10.2861