Chart of Caledonian MacBrayne - Passenger Numbers on 10 Busiest CalMac Routes (2015 vs 2014)

Reference 1: Passengers (2015), Passengers (2014).

Reference 2: Ardrossan - Brodick, Largs - Cumbrae, Wemyss Bay/Gourock - Rothesay, Oban - Craignure, Mallaig - Armadale, Ullapool - Stornoway, Fionnphort - Iona, Colintraive - Rhubodach, Kennacraig - Islay and Uig - Tarbert/Lochmaddy.

Source: http://en.wikipedia.org/wiki/Caledonian_MacBrayne