Year	Number
2004-01-01	64.6343
2005-01-01	71.5603
2006-01-01	83.0600
2007-01-01	99.4411
2008-01-01	116.7813
2009-01-01	106.5023
2010-01-01	112.3045
2011-01-01	122.5484
2012-01-01	135.9034
2013-01-01	145.0561
2014-01-01	149.1572
2015-01-01	145.8958
2016-01-01	142.6422
2017-01-01	142.1381