 Samir Guha Roy of the Indian Statistical Institute called these estimates "motivatedly exaggerated".After examining the population growth and demographic statistics, Roy instead states that a significant numbers of internal migration is sometimes falsely thought to be immigrants.An analysis of the numbers by Roy revealed that on average around 91000 Bangladeshi nationals might have crossed over to India every year during the years 1981–1991 but how many of them were identified and pushed back is not known.