user: Question: During what years did Nabatingue Toko play. 
Columns: ['Name', 'Position', 'Period', 'Appearances¹', 'Goals¹', 'Nationality²']
Types: ['text', 'text', 'text', 'real', 'real', 'text']
Sample row: ['Franck Tanasi', 'Defender', '1977 – 1979, 1982 – 1991', 253.0, 0.0, 'France']
SQL:

assistant: SELECT "Period" FROM "Table" WHERE "Name" = 'Nabatingue Toko';