Laarin 10-15% awon eniyan ni iriri wiwaye awon aami lakoko osu mefa lehin akoran akoko.. 
Àrùn yìí bẹ̀rẹ̀ ní àyé, níbi tí ó ti tàn dé Gúúsù Amẹ́ríkà nípasẹ̀ owó ẹrú ní 17 Century.. 