Assign rating to individual Choice items?

Hello, I'm trying to create a Sharepoint list of employees and their respective skills. Each skill has a rating from 1-4 indicating how proficient they are in it. Is there any way to implement this in a Sharepoint list besides manually creating 4 different versions of each skill? If not, is there a better way of implementing this? If possible, I want to keep this in Sharepoint to make it easy to access.