Year	Number
2004-01-01	238
2005-01-01	246
2006-01-01	298
2007-01-01	381
2008-01-01	505
2009-01-01	461
2010-01-01	484
2011-01-01	455
2012-01-01	487
2013-01-01	525
2014-01-01	422
2015-01-01	453
2016-01-01	497