user: Question: How many years did pia pajunen nina sundberg win women's doubles?
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: [1955.0, 'Lars Palmen', 'Inger Gerkman', 'Lars Palmen Harry Troupp', 'no competition', 'no competition']
SQL:

assistant: SELECT COUNT("Year") FROM "Table" WHERE "Women's doubles" = 'pia pajunen nina sundberg';