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

### Instruction:
What is the average number of years associated with 51 games tied and over 1184 total games?

### Inputs:
table_name: table, columns: ['Pac-12', 'Lost', 'Tied', 'Pct.', 'Years', 'Total Games']

### Response:
SELECT AVG Years FROM table WHERE Tied = 51 AND Total Games > 1184