Year	Number
2004-01-01	159.4595
2005-01-01	154.0541
2006-01-01	149.8069
2007-01-01	147.8764
2008-01-01	146.3320
2009-01-01	143.6293
2010-01-01	142.8571
2011-01-01	142.0849
2012-01-01	140.9266
2013-01-01	142.4710
2014-01-01	142.4710
2015-01-01	141.3127
2016-01-01	143.2432
2017-01-01	137.4517