1.An increase in the proportion of the elderly to total population
2.The sex ratio in Hong Kong started to decrease in the 1960s,then
increased in the mid-1990s.
3.The sex ratio in Hong Kong increased in the 1990s.
4.Since the mid-1990s,there have been more females then males in Hong
Kong .
更新1:
5.Beginning in the 1960s,there were always more males than females.From the mid-1990s onwards,there have been more females than males. 6.A large number of men marry foreign women.
