In 1983, 1995, and 2000, the percentage of boys who reported having sexual experience was 5.9 %, 10.4 %, and 13.9 %, respectively. For girls, the figures were 1.0 %, 6.7 %, and 10.4 %.
（見圖表）比較一九八三、一九九五、二○○○年的三次調查，自述有性交經驗的男生分別是百分之五．九、百分之十．四、百分之十三．九，女生為百分之一、百分之六．七、百分之十．四。