After the Thai nation Social and economic development plan 2504 (1961)-2509 (1966) make changes to population ratio is very much a death occurred from birth to death, or at least the Thai elderly people more.
The South The Social and Economic Development Plan 2504 - 2509, the rate of population change. Much less a little death to death. Thus, the number of elderly more.
After the development plan and economic society, the 2504 - 2509 increase the population change from born very dead. To be born a little less. Made in the elderly.