The provided bar chart illustrates the percentage of single-child families in urban areas, suburbs and countryside of China over a 20-year period, starting from 1980.
In general, over the given period, the percentages of only-child family units in three areas experienced an upward trend. There were great differences in the data of single-child families in the countryside compared with those of the other regions.
A closer look at the data reveals that the figure for one-offspring families in cities accounted for 50%, as opposed to 40% in suburbs. Meanwhile, the proportion of families having one child in rural areas was only 10% this year.
In the next 10 years, the tendency to have only one child in urban areas went up sharply to 95%. This trend continuously increased slightly to a peak of 100% in the final 10 years. Likewise, the percentage of one child family units in the outskirts witnessed a considerable rise during the 1980-2000 period and marked nearly similar quantities with cities, at 100% in 2000. In a similar way, the figure for only-child families in rural areas climbed slowly to 20% throughout the first 10 years, followed by a dramatic rise of 50% in the end of the period. 
The provided bar chart illustrates the percentage of single-child  
families
 in urban  
areas
, suburbs and countryside of China over a  
20-year
  period
, starting from 1980. 
In general
, over the  
given
  period
, the percentages of  
only
-child  
family
 units in three  
areas
 experienced an upward trend. There were great differences in the data of single-child  
families
 in the countryside compared with those of the other regions.
A closer look at the data reveals that the figure for one-offspring  
families
 in cities accounted for 50%, as opposed to 40% in suburbs. Meanwhile, the proportion of  
families
 having one child in rural  
areas
 was  
only
 10% this year.
In the  
next
 10 years, the tendency to have  
only
 one child in urban  
areas
 went up  
sharply
 to 95%. This trend  
continuously
 increased  
slightly
 to a peak of 100% in the final 10 years.  
Likewise
, the percentage of one child  
family
 units in the outskirts witnessed a considerable rise during the 1980-2000  
period
 and marked  
nearly
 similar quantities with cities, at 100% in 2000.  
In a similar way
, the figure for  
only
-child  
families
 in rural  
areas
 climbed  
slowly
 to 20% throughout the  
first
 10 years, followed by a dramatic rise of 50% in the  
end
 of the  
period
.