query: SELECT (COUNT(?lexeme) as ?lexemes) (COUNT(?ipa) as ?ipas) (?ipas/?lexemes as ?percent) WHERE {
    ?lexeme a ontolex:LexicalEntry;
         wikibase:lemma ?lemma;
         dct:language wd:Q36846;
         ontolex:lexicalForm ?form.
    OPTIONAL { ?form wdt:P898 ?ipa. }
  } ORDER BY ?lemma