Petrol Prices

Noticed of late that they are creeping up a bit, far behind us are out 88p days and they’ve broken the £/litre again. So I was wondering like the graphs of stocks and shares, what a petrol one would be like?
I get emailed every so often where the cheapest petrol station is and how much is going for, so I sorted through the last years worth, plonked it into a spreadsheet and voila:

Rising very sharply of late isn’t it?
This is for my area in Manchester. Petrol prices can be very localised so it may not necessarily correlate for you.