Year	Number
2004-01-01	53
2005-01-01	75
2006-01-01	133
2007-01-01	188
2008-01-01	214
2009-01-01	217
2010-01-01	219
2011-01-01	221
2012-01-01	227
2013-01-01	219
2014-01-01	212
2015-01-01	212