Year	Number
2004-01-01	0.4371
2005-01-01	0.4717
2006-01-01	0.5220
2007-01-01	0.6164
2008-01-01	0.8459
2009-01-01	0.9623
2010-01-01	1.5629
2011-01-01	1.6132
2012-01-01	1.7421
2013-01-01	1.7642
2014-01-01	1.8868
2015-01-01	2.0629
2016-01-01	2.1792