"A 1992 report prepared by B.B. Dutta for the North-Eastern Congr­ess Coordination Com­mittee meeting in Guwahati looked into both types of im­migration and notes: "Between 1971 and 1981, Bangladesh census records show a reduc­tion of 39 lakhs in the minority population. "Between 1981-89, 36 lakh religious minorities were missing from that coun­try."