Maybe like 2% of actors presence makes for trp rise. I think it would be very ignorant to think shows trps relay sinply on an actors presence. Majority of tv viewers in india come from homes who dont give a butt about who the actor is. The first determination of whether they would watch a show or not is if they have the channel at home. Then its based on what looks good and what holds their interest. Im sure some people do watch for the actors like the actors fans but fans contributing to trps of shows is not that great...compared to average joes watching. Espexially if you are basing this off of IF standards. Then look at people like Sanaya Irani Drashti Dhami (this is only to make a point) they are farely popular leading ladies id say but Rangrasiya didnt garner much trp. And madhubala did for a bit because of content but even that started sinking.
So all in all i think actors presence does contribute but only a smidgen compared to story content and channel availability. 😊