Year	Number
2004-01-01	1.9091
2005-01-01	2.1343
2006-01-01	2.8278
2007-01-01	3.5089
2008-01-01	4.1369
2009-01-01	4.6286
2010-01-01	5.0635
2011-01-01	5.4733
2012-01-01	5.9134
2013-01-01	6.4581
2014-01-01	7.2178
2015-01-01	8.0119
2016-01-01	8.3207