Year	Number
2004-01-01	131.8611
2005-01-01	166.2639
2006-01-01	196.5453
2007-01-01	233.1167
2008-01-01	258.4674
2009-01-01	257.0312
2010-01-01	251.3498
2011-01-01	252.2286
2012-01-01	258.5709
2013-01-01	258.1929
2014-01-01	257.9513
2015-01-01	258.7334
2016-01-01	254.6573
2017-01-01	254.9666