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
CREATE TABLE cites
(
    cited_paper_id  TEXT not null,
    citing_paper_id TEXT not null,
    primary key (cited_paper_id, citing_paper_id)
);
CREATE TABLE paper
(
    paper_id    TEXT  not null
        primary key,
    class_label TEXT not null
);
CREATE TABLE content
(
    paper_id     TEXT not null,
    word_cited_id TEXT not null,
    primary key (paper_id, word_cited_id),
    foreign key (paper_id) references paper(paper_id)
);
