Please help me to review ielts task 1, thanks

Given in the line graph concerning the changes of the birth rates of China and the United States from 1920 to 2000.

From an overall perspective, what stands out from the chart is that the birth rates of both mentioned nations dramatically decreased over the period of 80 years. Although the two trends were similar in terms of a general decline, the birth rate of China was slightly higher than that of the USA.

As is illustrated, the USA witnessed a fluctuation in the birth rat around approximately 12% from 1920 to 1940. However, in the following decade, the America birth rate fell dramatically by as many as 8% to under 5%. In the 1950, the figure for the USA increased sharply to exactly 15%, which was the highest point during the 80-year period. In contrast, throughout the remainder of the period, there was a gradual decline in the US birth rate, which fell to 8% by the year 2000.

In terms of the rate of birth in China, there was a rapid variation than that of the US during the first 20 years of the period. It dropped to 5% within 5 years before reaching the peak at 20% in 1955. By contrast, the birth rate in China reduced suddenly by as many as 12% to approximately 8% in 1960 and then keep continue decreasing to 3% in 2000.