Year	Number
2004-01-01	0.2751
2005-01-01	0.5820
2006-01-01	0.7448
2007-01-01	0.9985
2008-01-01	1.2260
2009-01-01	1.3334
2010-01-01	1.3980
2011-01-01	1.5628
2012-01-01	1.7143
2013-01-01	1.8004
2014-01-01	2.0473
2015-01-01	2.2839
2016-01-01	2.5522
2017-01-01	2.8875