IELTS: Birth rates in China and the USA from 1920 to 2000

The graph illustrates birth rates in china and the USA from 1920 to 2000. Both of these countries have different number of birth rates.

The graph shows for 30 years USA and China have same numbered of birth rates in every year. Nevertheless, along 50 years latest until year 2000 birth rates in china decreased sharply from 13% to 2%. And then, in USA the birth rates decreased dramatically until 7%.

The USA line shows, birth rates from 1920 to 1940 fluctuated. Then, in 5 years this number decreased dramatically 5% birth rates in 1945. From 1945 to 1950 increased sharply 15%. And then, along half decade birth rates decreased dramatically from 15% to 7%.

The china line shows, birth rates from 1920 to 1935 increase dramatically 15%. From 1935 to 1940 decreased sharply 5%. Next, leveling off is along 5 years. And then, birth rates increased sharply 20% from 1945 to 1950. During half decade birth rates decreased sharply until 2%.

To sum up, birth rates in china during half decade from 1950 to 2000 more overwhelmed than birth rates in USA decreased sharply. The birth rates in USA decreased dramatically 7%.

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  Birth_rates_in_china.png
  

You should put verb in this sentence

The graph illustrates birth rates in china and the USA from 1920 to 2000. Both of these countries have different number of birth rates.
The first part is enough for your intro!

This is not a proper Overview. Talk about the most obvious trend/ trends in the overview.