user: Question: Name the year for womens doubles being Raina Tzvetkova Emilia Dimitrova
Columns: ['Year', 'Mens singles', 'Womens singles', 'Mens doubles', 'Womens doubles', 'Mixed doubles']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1985.0, 'Jeliazko Valkov', 'Diana Koleva', 'Ilko Orechov Nanko Ertchopov', 'Diana Koleva Zlatka Valkanova', 'Jeliazko Valkov Dobrinka Peneva']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Womens doubles" = 'Raina Tzvetkova Emilia Dimitrova';