user: Question: What is the sum total of all the years with a bell that weighed 857 kilograms?
Columns: ['Year', 'Foundry', 'Diameter (mm)', 'Weight (kg)', 'Nominal Tone']
Types: ['real', 'text', 'real', 'text', 'text']
Sample row: [1956.0, 'F. W. Schilling', 2023.0, '4 935', 'g°']
SQL:

assistant: SELECT SUM("Year") FROM "Table" WHERE "Weight (kg)" = '857';