Here is the list includes top IIMs such as IIM Ahmedabad, Bangalore, Calcutta and Lucknow. While IIM Ahmedabad releases the audited report by IPRS, the other old IIMs do not divulge the data on salary figures, leading to obscurity. You can go through with the given below link.

https://news.careers360.com/mba-final-placement-2018-analysis-mixed-season-little-cheer-top-b-schools

For the previous year placement records I would suggest you to prefer only the official website of each IIM Institute.

Good Luck!