Adding metric data

Just sent an email to Turkish Airlines investor relations to ask for a metric value. Let's see how they react to such requests.

--Philipp.....2016-12-14 15:21:33 UTC

This is the related metric I was asking data for: http://wikirate.org/Philipp+Carbon_Emissions_per_Passenger_Kilometre

--Philipp.....2016-12-14 15:22:02 UTC