Twenty years ago, Shetzu Island had only 2-3,000 residents and after the island was designated as a protected area, the city government adopted strict restrictions about people moving to the island.
廿年前社子島不過二、三千人，宣佈為保留區後，市府對遷入戶口採取嚴格限制，但「在地人」代代繁衍，如今也有萬餘人。