user: Question: What was the issue price for the Trumpeter Swan set?
Columns: ['Year', 'Theme', 'Artist', 'Mintage', 'Issue Price']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2002.0, '15th Anniversary Loonie', 'Dora de Pédery-Hunt', '67,672', '$39.95']
SQL:

assistant: SELECT "Issue Price" FROM "Table" WHERE "Theme" = 'Trumpeter Swan';