Year	Number
2004-01-01	11.7672
2005-01-01	14.3543
2006-01-01	16.1901
2007-01-01	17.5168
2008-01-01	18.2617
2009-01-01	21.4666
2010-01-01	29.6434
2011-01-01	31.8708
2012-01-01	37.5830
2013-01-01	29.5360
2014-01-01	32.1450
2015-01-01	33.5934