回复7楼:In the United States, an estimated 460,000 children are reported missing every year.
https://www.fbi.gov/file-repository/2015-ncic-missing-person-and-unidentified-person-statistics.pdf/view
多亏了热心的路人，才每年失踪了区区46万儿童

大部分都是叛逆的teenager离家出走

https://picx.zhimg.com/80/v2-56b9e29bbb030a74aff1de1f06d4d2a6_720w.webp?source=1def8aca

https://tech.chinadaily.com.cn/a/202102/26/WS60386587a3101e7ce9741248.html
不过，2020年我国100万的#走失#人次，相较于2016年的394万人次以及2017年的260万人次已经显著减少。我国走失人群规模呈现逐年递减的状态，相比于五年前，该群体人数已经减少近75%。

During 2015, 634,908 missing person records were entered into NCIC, an increase of .1% from the 634,155 records entered in 2014. Missing
Person records purged during the same period totaled 634,742. Reasons for these removals include: a law enforcement agency located the
subject, the individual returned home, or the record had to be removed by the entering agency due to a determination that the record is invalid.

報告失蹤和實際失蹤是不同的。有心去查fbi資料，有心使用春秋筆法，可能查到中國真實的同類數據？