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

### Instruction:
How many world rankings are after Aug 5, 1980 ?

### Inputs:
table_name: table, columns: ['Year', 'Performance', 'World Ranking', 'Venue', 'Date']

### Response:
SELECT SUM World Ranking FROM table WHERE Date = aug 5 AND Year > 1980