What is the most common job in Oklahoma?

Could you tell me, what is the occupation that holds the highest number of positions in Oklahoma? I'm curious to know if it's a sector that's been growing steadily, or if it's a traditional role that's remained resilient through the years. Is there a particular reason why this job is so prevalent in the state? Perhaps it's tied to the local economy, resources, or even the cultural identity of Oklahoma. I'd appreciate any insights you have on this topic.