Hm... I suppose if a business is robbed, it's one crime whether it was done by two people or a gang of 50.
You'd have to put these figures together with the arrest figures and charge/conviction figures over the summer to get a true picture.
Also, outside the hotspots of Hackney, Croydon, Clapham Jn and a few others, there was a lot of stuff called 'rioting' that wasn't - down my high street the media tried saying 'rioting has spread to X', but then they interviewed a bunch of business owners who all said 'no it isn't, this is just a bit of typical weekend vandalism that's just getting bigged up'. It's quite likely there wasn't that much 'extra' crime compared to a typical Saturday night of people out on the piss (especially as many of those would have stayed home to avoid it).