user: Question: When the Year is over 2008, what is the highest Mintage for the Royal Canadian Mint Engravers Artist?
Columns: ['Year', 'Artist', 'Composition', 'Mintage', 'Issue Price']
Types: ['real', 'text', 'text', 'real', 'text']
Sample row: [2007.0, 'Steve Hepburn', '99.99% pure gold', 200.0, '$5,999.95']
SQL:

assistant: SELECT MAX("Mintage") FROM "Table" WHERE "Artist" = 'Royal Canadian Mint Engravers' AND "Year" > 2008.0;