This image illustrates a line graph that highlights the premium unleaded petrol and diesel pump prices in the UK, from 1999 to 2008, in pence per litre. It is evident that the prices of premium unleaded petrol and diesel follow a very similar pattern. Both started at over 60 pence per litre in 1999 and gradually increased to its maximum in mid-2007, where premium unleaded was at 120 pence per litre and diesel was at 130 pence per litre. Both prices dropped by 20 pence per litre in 2008.