Over 127,935 Tibetans have been living outside Tibet till April 12 2009, as compared to 111,020 persons in 1998, a survey reveals.
As per a report published by the Planning Commission of the Central Tibetan Administration on the latest population census, of the total population till 2009, 70,556 were males and 57,379 females.
94,203 of the population lived in India, 13,514 in Nepal, 1,298 in Bhutan and 18,920 elsewhere, the study titled Demographic Survey of Tibetans in exile-2009.
Tibetans in exile make up about 3 per cent of the total ethnic Tibetan population in the world, with the rest, living in the Tibetan areas of People's Republic of China.
The annual growth rates which were hovering around estimated 2.8 per cent for the last thirty years, has declined below 2 per cent, the study states.
According to the survey, the annual growth rate of the Tibetan population in exile is 1.96.
The Total Fertility Rates, based on "own-child method" for the period prior to 1998 was estimated to be as high 4.9 during 1987-89 has gone down to 1.18 in 2009, thus showing a total decline in the fertility level of 3.65 in 2009.
The survey lists two major factors that might have caused the fertility transition in Tibetan population.
Literacy figures confirm that child bearing Tibetan women are more educated than their parents and were brought up in relatively better economic positions.
This cohort takes longer time in building their careers that delay their age at marriage resulting in fewer children or forgoing having them altogether.
Besides, the contraceptive prevalence has risen substantially from only 10 per cent among the married women in 1980's to 95 per cent in 2001.
The sex ratio for Tibetan population in exile is 798 females per 1000 males, which is an improvement of 6 points over 792 recorded in 1998.
As per the latest survey, there is an impressive surge of 10.1 per cent in general literacy rate from 69.3 per cent in 1998 to 79.4 per cent in 2009.
The infant mortality rate of the Tibetan population in exile was recorded as 15.44 per 1000 child-births and it has gone down to 60.3 percent in comparison to 1998.