Year	Number
2004-01-01	10.5023
2005-01-01	11.7801
2006-01-01	13.2138
2007-01-01	15.0894
2008-01-01	16.4263
2009-01-01	17.3878
2010-01-01	18.6882
2011-01-01	18.9321
2012-01-01	20.9728
2013-01-01	21.3318
2014-01-01	22.4877
2015-01-01	23.9857
2016-01-01	25.1781