user: Question: What is the mean year when the women's doubles team was Helena Turcinková / Buresová?
Columns: ['Year', "Men's singles", "Women's singles", "Men's doubles", "Women's doubles", 'Mixed doubles']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1965.0, 'Miroslav Pezlar', 'Vera Perinová', 'Miroslav Pezlar / Ladislav Rehor', 'Vera Perinová / Miluse Bilciková', 'Petr Nadvorník / Vera Perinová']
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "Women's doubles" = 'Helena Turcinková / Buresová';