user: Question: Who was the winner after 1989 when Stronach Stable was the owner?
Columns: ['Year', 'Winner', 'Jockey', 'Trainer', 'Owner']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2013.0, 'Hessonite', 'Junior Alvarado', 'David G. Donk', 'Punk/Dileo']
SQL:

assistant: SELECT "Winner" FROM "Table" WHERE "Year" > 1989.0 AND "Owner" = 'Stronach Stable';