Please check my fault in this IELTS task 1 essay. Thank you!

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

Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The line graph illustrates the proportion of children who born in the USA and China over the period of eighty years.

Overall, the birth rates of both nations decreased from 1920 to 2000. Although the two trends were similar in term of decline, the birth rate of the USA in most years was higher than that of China.

However, from 1920 to 1935, the USA’s birthrate fluctuated, it always remained above 10%. After that, it dropped dramatically to below 5% in 1940, which was it’s the lowest point during the period of eighty years. In the next decade, the figure for the USA rose rapidly and reached the highest point at exactly 15% in 1945. Throughout the remainder period, although the birth rate of the USA gradually decreased, it always higher than that of China.

Over the same period, the birth rate of China varied more significantly than in that of the USA. It dropped to 5% from 1940 to 1945 before reaching the highest point of the whole line graph, 20%, in 1950. By the contrast, the figure for China decreased rapidly to below 10%, falling to approximately 20% in 2000.