Year	Number
2004-01-01	1.0870
2005-01-01	1.4493
2006-01-01	1.5152
2007-01-01	1.9433
2008-01-01	2.3057
2009-01-01	2.7009
2010-01-01	3.0303
2011-01-01	3.3926
2012-01-01	3.9196
2013-01-01	4.7101
2014-01-01	4.9736
2015-01-01	5.8630