Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the average number of runner-up that National University, which has more than 2 total championships, has?

### Inputs:
table_name: table, columns: ['University', "Men's", "Women's", 'Runner-up', 'Total Championships']

### Response:
SELECT AVG Runner-up FROM table WHERE University = national university AND Total Championships > 2