Year	Number
2004-01-01	30.1712
2005-01-01	35.0697
2006-01-01	40.1846
2007-01-01	46.7889
2008-01-01	50.9513
2009-01-01	51.8641
2010-01-01	50.0390
2011-01-01	50.2633
2012-01-01	54.1301
2013-01-01	52.3916
2014-01-01	54.8083
2015-01-01	54.8532
2016-01-01	62.1718