Year	Number
2004-01-01	42.5606
2005-01-01	42.7348
2006-01-01	44.3315
2007-01-01	47.0315
2008-01-01	49.4121
2009-01-01	49.2960
2010-01-01	47.3944
2011-01-01	46.3347
2012-01-01	44.4332
2013-01-01	44.5928
2014-01-01	52.2717
2015-01-01	49.0928
2016-01-01	48.9621
2017-01-01	49.0057