sˈɪkstiːn ɪz ɐn ʌnjˈuːʒuːəl nˈʌmbɚ, fˈaɪv, sˈɪks, ˈeɪt, tˈɛn ɔːɹ æt ðə mˈoʊst twˈɛlv wʊd biː tˈɪpɪkəl: ɪn tˈuː θˈaʊzənd ˈeɪt ˈoʊnli θɹˈiː ɹˈɪŋz ʌv sˈɪkstiːn ɛɡzˈɪst ɪnðə wˈɜːld.
Sixteen is an unusual number, five, six, eight, ten or at the most twelve would be typical: in 2008 only three rings of sixteen exist in the world.