Table 1. Lists of vowel phonemes from the ph source ranked by frequency up to the 20th position

Phoneme	Frequency (%)	Phoneme	Frequency (%)
i	860 (94.2)	oː	269 (29.5)
u	833 (91.2)	eː	266 (29.1)
a	817 (89.5)	ə	256 (28.0)
o	760 (83.2)	ɪ	156 (17.1)
e	757 (82.9)	ɔː	156 (17.1)
ɛ	439 (48.1)	ʊ	150 (16.4)
ɔ	436 (47.8)	ɛː	148 (16.2)
iː	315 (34.5)	ĩ	141 (15.4)
aː	304 (33.3)	ã	134 (14.7)
uː	296 (32.4)	ũ	129 (14.1)

The percentage values are calculated from 913 languages.