I analyzed a 10KB corpus of texts (some from the Toki Pona mailing list, some from jan Pije and Yves Prudhomme's sites) and analysed them with a Perl script to get these frequencies. This doesn't consider syllable-final 'n' a distinct phoneme from syllable-initial 'n'; I'll need a more sophisticated script for that.

Mi analizis 10-litermilan tekstaron en Tokipono kaj trovis la jenajn oftecojn por la fonemoj de Tokipono: