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period	re-sorted			messages
October to December 2015	by thread	by author	by subject	5
October to December 2014	by thread	by author	by subject	3
July to September 2014	by thread	by author	by subject	13
April to June 2014	by thread	by author	by subject	68
January to March 2014	by thread	by author	by subject	37
October to December 2013	by thread	by author	by subject	60
July to September 2013	by thread	by author	by subject	54
April to June 2013	by thread	by author	by subject	31
January to March 2013	by thread	by author	by subject	10