user: Question: What is every value for percentage(2006) with a Polish mother tongue?
Columns: ['Mother Tongue', 'Population (2006)', 'Percentage (2006)', 'Population (2011)', 'Percentage (2011)']
Types: ['text', 'real', 'text', 'real', 'text']
Sample row: ['English', 8085.0, '45.22%', 7615.0, '42.41%']
SQL:

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