Year	Number
2004-01-01	11.7160
2005-01-01	13.8833
2006-01-01	12.6459
2007-01-01	21.4754
2008-01-01	24.1045
2009-01-01	25.8283
2010-01-01	25.7673
2011-01-01	21.9155
2012-01-01	22.5255
2013-01-01	22.0572
2014-01-01	21.8472
2015-01-01	23.0014
2016-01-01	24.2154
2017-01-01	25.5753