Keeping track: gas prices

US gas prices are again on the rise after falling for eight weeks in a row. The reason? US crude-oil supplies are at their lowest level in years. Oil prices have jumped 15 percent this month to about $32 a barrel.

High crude-oil costs have also made gasoline more expensive around the world. But global gasoline prices often differ because of hefty taxes. In Norway, for example, a gallon of gas, on average, costs $5.09 while on the other side of the globe in New Zealand, the price is $1.97.

Here's how taxes contribute to the price of a gallon of gas in the US and other parts of the world:

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