user: Question: What was the percentage in 2006 whose natives is Polish?
Columns: ['Mother Tongue', 'Population (2006)', 'Percentage (2006)', 'Population (2011)', 'Percentage (2011)']
Types: ['text', 'real', 'text', 'real', 'text']
Sample row: ['English', 525.0, '55%', 445.0, '48.37%']
SQL:

assistant: SELECT "Percentage (2006)" FROM "Table" WHERE "Mother Tongue" = 'Polish';