user: Question: What couple had vote percentage of 21.843%?
Columns: ['Rank', 'Couple', 'Judges', 'Public', 'Total', 'Vote percentage', 'Result']
Types: ['real', 'text', 'real', 'real', 'real', 'text', 'text']
Sample row: [1.0, 'Ray and Maria', 6.0, 4.0, 10.0, '20.482%', 'Safe']
SQL:

assistant: SELECT "Couple" FROM "Table" WHERE "Vote percentage" = '21.843%';