If you analyze the Geographic readings carefully, you would find that during the year 2003, South Korea which is known to be located in the easternmost part of the Asian continent had the lowest fertility rate which is beyond replacement levels.
When compared globally with other countries, you would find that there are only 0.9 children per woman. Various analysts are of the view that this is because of the country's high economic inequality such as the expensive cost while living, undesired wages which don't match up to the living standards, lack of job facilities, incapable to buy houses which is beyond their affordability.