The upper bar graph compares the number of people during a period of 60 years, and the bar graph below illustrates the proportion of people, which in terms of five age groups throughout the same period.
It’s noticeable that the town had the largest population in 1991, and there’s a trend that the trend of an aging population is significantly increasing.
Looking at the first bar graph, the town saw an increase in population in the early 40 years, with the number rose about 50000 people per year, then it reached a peak of 200000 people, then the number fell by 25000 in the rest of 20 years.
Acoording to the second bar chart, most of people were middle-aged in 1951, which by far the highest among other ages of people, then it declined drastically, with the number about 65 percent to a nadir of 30 percent. The number of teenagers and children had slightly uprising, and the proportion maintained in a range of 10 percent. However, elders saw an continuous increase in population, with the number from 10 percent to 25 percent approximately, which ranked the first among those citizens.