Year	Number
2004-01-01	1.4361
2005-01-01	1.5219
2006-01-01	1.5790
2007-01-01	1.6362
2008-01-01	1.7648
2009-01-01	1.7862
2010-01-01	1.9077
2011-01-01	2.0649
2012-01-01	2.2864
2013-01-01	2.4507