Year	Number
2004-01-01	4.7658
2005-01-01	5.0569
2006-01-01	5.6149
2007-01-01	6.4263
2008-01-01	7.4189
2009-01-01	8.1334
2010-01-01	8.3358
2011-01-01	8.5896
2012-01-01	8.4444
2013-01-01	8.9887
2014-01-01	9.6416
2015-01-01	9.5932