In 2010, the population of wild Bengal tigers in the Indian subcontinent is estimated to be fewer than 2,500, says Wikipedia.
Of these, 1,165–1,657 are found in India, 200–419 in Bangladesh, mostly in the Sunderbans, 100–194 in Nepal and 67–81 in Bhutan.
Over the past century tiger numbers have fallen dramatically, with a decreasing population trend. None of the Tiger Conservation Landscapes within the Bengal tiger range is large enough to support an effective population size of 250. Habitat losses and the extremely large-scale incidences of poaching are serious threats to the species' survival.[1]