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

### Instruction:
This constellation with a ranking of 51 has how many percentages on record?

### Inputs:
table_name: table, columns: ['Rank', 'Family', 'Abbre\xadviation', 'Constellation', 'Area (sq.deg.)', 'Area (msr)', 'Per\xadcent\xadage', 'Right ascension (hm)', 'Decli\xadnation (dm)', 'Quad']

### Response:
SELECT COUNT Per­cent­age FROM table WHERE Rank = 51