Year	Number
2004-01-01	55.4213
2005-01-01	57.1670
2006-01-01	64.4599
2007-01-01	63.4780
2008-01-01	66.1878
2009-01-01	69.8595
2010-01-01	71.7600
2011-01-01	69.9265
2012-01-01	63.8866
2013-01-01	52.8984
2014-01-01	53.3503
2015-01-01	51.2006
2016-01-01	50.0662
2017-01-01	48.9353