What values could reasonably be both an annual salary and an hourly wage in the US, where this data is from? While of course mixing annual and hourly is bad practice and makes sorting pretty useless, it shouldn’t be difficult to distinguish the two if one is so inclined. I imagine there’s a very clear gap in that sorted sequence where the hourly values transition to annual. Take 20,000. As an annual salary you’d be living in poverty, and as an “hourly wage” you’d be making over $40,000,000 annually. No one making that much is actually paid an hourly wage of $20,000.

Then you can just look at the annual ones. Anything over 75k is more than safe to say is annual. I only go that high because it seems like you need certainty that it is not quarterly or bi-annual.