Live-singing and lip sync?

Does anyone know which songs Michael actually sang live on his tours and which were lip-synced? And did it vary this year? As far as I know, he sang completely live on WBSS, Human nature, IJCTLY and SOOML at all his shows. Were there any others? There is a video on Youtube of rehearsals for the Dangerous and This is it tours where he sings the songs live, but why doesn't he sing them at the shows? What's he doing with that?