Year	Number
2004-01-01	1.1937
2005-01-01	2.1081
2006-01-01	2.0194
2007-01-01	1.9594
2008-01-01	1.9153
2009-01-01	1.8722
2010-01-01	1.8224
2011-01-01	4.0590
2012-01-01	4.4189
2013-01-01	5.0407
2014-01-01	5.1797
2015-01-01	5.1799
2016-01-01	5.0444
2017-01-01	5.4647