Year	Number
2009-01-01	7161867
2010-01-01	7130247
2011-01-01	6956546
2012-01-01	6660927
2013-01-01	6335248
2014-01-01	6176665
2015-01-01	6082971
2016-01-01	5926573
2017-01-01	6326381