Among all the citation, what is the percentage of paper ID under the Agents classification?
classification refers to class_label; class_label = 'Agents'; percentage = (divide(count(paper_id where class_label = 'Agents')), (count(paper_id)))*100;
SELECT CAST(COUNT(CASE WHEN class_label = 'Agents' THEN paper_id ELSE NULL END) AS REAL) * 100 / COUNT(paper_id) FROM paper
database name:db_id citeseer
cites table cites Cols: cited_paper_id dtype text, citing_paper_id dtype text, 
paper table paper Cols: paper id dtype text, class label dtype text, 
content table content Cols: paper id dtype text, word cited id dtype text, 
