Reserves are a measure of the quantity of oil or gas that is estimated to be recoverable from the assets an oil and gas producer owns. In Canada, we report our reserves on a proved plus probable basis at year end in accordance with National Instrument 51-101 based on evaluations from third party reserve engineers. As of December 31, 2009, our proved plus probable reserves totaled 344,864 MBOE.

One measure of the longevity of our reserves is the reserve life index ("RLI"), which is calculated by dividing year-end reserves by expected annual production. We estimated our RLI at the end of 2009 to be 10.9 years.

For a detailed discussion of our reserves and net asset value, please see the 2009 Year-End Results and Reserves Information news release.