请按要求改写这个句子
问题描述：
请按要求改写这个句子
改写这段话：“A survey in the 2000s revealed that 60percent of respondents said they had an affair at some point during theirmarriage,compared to 15 percent in the 1980s.”
要求：不要改变原句的意思,不能copy连续三个及三个以上的单词,不要插入个人的看法,可以选择适当的同义词替换.
having an affair 是有外遇的意思
答
An investigation shows that in 1980 15% of people surveyed said they cheated on, 20 years later, 60% of people admitted that he was having an affair