Please help me to check my ielts writing task 1

Topic: The graph below compares changes in the birth rates of China and the USA between 1920 and 2000

The line graph indicates the comparison in the birth rate over the period of 80 years from 1920 to 2000 in China and the USA

Overall, the birth rates of both nations showed the downward trend. Although the two trend were similar in terms of general declined, the birth rate of the USA in most years were higher than that in China.

From 1920 to 1935, there was a fluctuation in the birth rate in America ( in the range of 10 to 15). However, in the following decades, it lost momentum and plunged to the rock bottom at under 5% before rebounding and increasing significantly to 15% in 1950, which was the highest point during the period of 80 years. Then, the birth rate in America declined gradually, which fell to 7% at the end of the survey.

Over the same period, the birth rate in China varied more significant than that in America. It dropped considerably at 5%, and remained stable from 1940 to 1945, before soaring and reaching the highest point of the whole line graph at 20%, in 1950. In the contrast, the rate of birth in China sharply decrease by over 10%, falling to approximately 2% in 2000