user: Question: When was the Hopperstad stavkyrkje built?
Columns: ['Parish (Prestegjeld)', 'Sub-Parish (Sokn)', 'Church Name', 'Year Built', 'Location of the Church']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Vik Parish', 'Arnafjord', 'Arnafjord kyrkje', '1645', 'Arnafjord']
SQL:

assistant: SELECT COUNT("Year Built") FROM "Table" WHERE "Church Name" = 'Hopperstad stavkyrkje';