The average attendances of both Old Firm clubs are regularly within the top twenty across Europe.[76][77] A study of stadium attendance figures from 2013 to 2018 by the CIES Football Observatory ranked Celtic at 16th in the world during that period and Rangers at 18th, even though Rangers had been playing at lower levels for three of those five seasons. Celtic's proportion of the distribution of spectators in Scotland was 36.5%, the highest of any club in the leagues examined, with Rangers' 27.4% placing them 8th overall for national audience share.[78]