Year	Number
2004-01-01	168.1081
2005-01-01	165.9946
2006-01-01	163.7156
2007-01-01	159.6886
2008-01-01	158.4859
2009-01-01	156.2396
2010-01-01	151.2236
2011-01-01	151.4465
2012-01-01	151.2438
2013-01-01	155.9516
2014-01-01	170.2951
2015-01-01	176.9730
2016-01-01	183.4770
2017-01-01	189.6219