jakarta indonesian prosecutor name 18 people suspect graft case relate erection anti-corruption monument mean champion probity public affairs monument inaugurate riau province city pekanbaru last december corruption eradication commission kpk chairman agus rahardjo mark international anti-corruption day sugeng riyanta special crime assistant riau prosecutor office say 13 public servants five private sector officials suspect fraud corruption cause state losses 1.23 billion rupiah 91,000 riyanta say investigation would center selection contractor quality materials use build monument president joko widodo pledge tackle corruption long scourge business government indonesia country rank 90th 176 transparency international corruption perceptions index last year graft suspect indonesian anti-corruption monument project