Help me to correct my Writing 1 for IELTS. I really appreciate it!

The graph compares the number of farms and workers in the USA during the period 1910-2000. Overall, the figures for both factors show a downward trend during the time given.

In the first twenty years, while the number of farms started at 6.5 millions in 1910 and remained stable in the following years, the number of people working on farms decreased slightly from 13.5 millions to 12.4 millions. In the next five years, there was a minimal rise in both figures, 6.8 millions and 12.5 millions , respectively. Between 1935 and 1970, the number of farms and workers experienced a dramatic decline in which farm numbers were only 3 million whereas worker numbers were 4.5 millions. However, from 1945 to 1950, the figure of workers hovered around 10 millions. For the rest of the period, both figures continued to fall at the a similar steady rate, ending the period at 2 millions of farms as opposed to 3 millions of workers.

To sum up, we can see clearly that although there is a downward trend in the number of farms and workers, the figures numbers of workers were consistently higher than these those of farms.

We use decimal 'points', not decimal commas, in the US

We say 'there are millions of people' but when specific, we say 'there are 12 million people'.