Year	Number
2004-01-01	0.5800
2005-01-01	0.9524
2006-01-01	1.5111
2007-01-01	1.9400
2008-01-01	2.2691
2009-01-01	2.2713
2010-01-01	1.9676
2011-01-01	1.9446
2012-01-01	1.9487
2013-01-01	1.9343
2014-01-01	1.8167
2015-01-01	1.8727
2016-01-01	2.1959
2017-01-01	2.3422