How many countries in the dataset have an average temperature above 15°C from 1970 to 2013?

How many countries in the dataset have an average temperature above 15°C from 1970 to 2013?: a task in SmolDataEnvs-harbor-train-sandbox: 📊 SmolDataEnvs: Harbor (train) (Harbor dataset). Files (in /home/user/input, no subfolders): - GlobalLandTemperaturesByState.csv