Year	Number
2004-01-01	10.8527
2005-01-01	11.8002
2006-01-01	13.3506
2007-01-01	15.6761
2008-01-01	18.6908
2009-01-01	21.4470
2010-01-01	23.8587
2011-01-01	18.9492
2012-01-01	20.2412
2013-01-01	20.1550
2014-01-01	24.2894
2015-01-01	20.2412
2016-01-01	22.3945