user: ### NOW ANSWER:
Question: What is the sum of Year, when Rank is less than 19?
Columns: ['Publication', 'Country', 'Accolade', 'Year', 'Rank']
Types: ['text', 'text', 'text', 'real', 'real']
Sample row: ['MTV', 'United States', '"100 Greatest Videos Ever Made"', 1999.0, 19.0]
SQL:

assistant: SELECT SUM("Year") FROM "Table" WHERE "Rank" < 19.0;