A financial services firm is performing a quantitative risk assessment on its data center. Historical records and industry data show that a major power outage affecting the facility has occurred roughly twice over the past ten years, and each event causes losses estimated at $150,000. The single loss expectancy (SLE) is already documented at $150,000. Which value should the risk analyst use for the annualized rate of occurrence (ARO) when calculating the annualized loss expectancy (ALE)?