Statistics, gotta love em

I'm sure some one can offer a rational explanation for the dummies like myself but I was pretty sure when I changed job locations in 2005 that figures were similar to now so I did some research and found this.
In 2005 right through the year the Aussie dollar was worth around the same as now against the greenback (www.x-rates.com)

The oil price per barrel was also around the same as it is now.
(www.caltex.com.au)

so the dollar was the same and oil was the same so where were petrol prices? They Started the year around 0.95/L ranging to
1.25/L after hurricane Katrina and settling at years end Finishing 2005 at just over 1.10 per litre (www.caltex.com.au)
Which coincidently is what someone from the NRMA said we should be paying right now but his colleagues disagreed and said around $1.20 was more realistic.
Both these figures are a far cry from $1.40 to $1.50 we pay now please someone explin it to me again just how we are not getting played. But we have no choice.

Sorry Just releasing some frustration after filling up both tanks cost me over $300. No its not a truck its a twin tank cruiser