Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE documents (access_count INTEGER, document_structure_code VARCHAR)
### Question:
Find the average access count of documents with the least popular structure.
### Answer:
SELECT AVG(access_count) FROM documents GROUP BY document_structure_code ORDER BY COUNT(*) LIMIT 1