user: Question: Name the sum of hull number for Italy and year more than 1999
Columns: ['Hull No.', 'Year', 'Project', 'Length overall in meters (without bowsprit)', 'Name', 'Destination']
Types: ['real', 'real', 'text', 'real', 'text', 'text']
Sample row: [1.0, 1978.0, 'Aegean - 53', 16.0, 'Bebek', 'Turkey']
SQL:

assistant: SELECT SUM("Hull No.") FROM "Table" WHERE "Destination" = 'Italy' AND "Year" > 1999.0;