user: Question: This constellation with a ranking of 51 has how many percentages on record?
Columns: ['Rank', 'Family', 'Abbre\xadviation', 'Constellation', 'Area (sq.deg.)', 'Area (msr)', 'Per\xadcent\xadage', 'Right ascension (hm)', 'Decli\xadnation (dm)', 'Quad']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Her', 'Hya', 'Hydra', '1302.844', '396.869', '3.16%', '1136.73', '−1431.91', 'SQ2']
SQL:

assistant: SELECT COUNT("Per­cent­age") FROM "Table" WHERE "Rank" = 51.0;