Although Japan's crime rate is still low compared to other advanced countries, the present figure is about double the rate in 1980 and the highest number since World War II.〔【出典】Hiragana Times, 2004年9月号◆【出版社】株式会社ヤック企画 〕"HT215016", "2241753"
犯罪数の増加
an increase in the number of crimes
犯罪数の減少
a decrease [decline, drop] in the number of crimes
青少年の犯罪数の増加がテレビの影響であるという根拠
evidence to prove that the increase in the number of crimes by minors can be attributed to TV programs