A freedom of information request found that Strathclyde Police incurred costs of £2.4 million for the seven derbies played during the 2010–11 season, with the clubs only contributing £0.3 million towards that.[39] Other high-profile games involving Rangers and Celtic incurred much lower costs.[39] The reason for the disparity in costs and the contribution made is that Strathclyde Police had to increase its activity elsewhere in Glasgow and beyond, while the clubs were only responsible for costs incurred in the vicinity of their stadium.[39] In a period between April 2016 and December 2017, when nine matches were contested (three each at the club's stadiums and three at Hampden), more than £550,000 was spent by Celtic, Rangers, the SFA and the SPFL on policing inside the stadium alone.