How to use "Ratio", "Disproportion" and "volume" in the IELTS Task1 report???

In Cambridge7 Test2 Writing1-Line graph (P53)

I want to use "ratio" to describe this trend
This is part of my sentences:

For chicken consumption, the figure for the time point 1979 and 2004 illustrated a ratio of one to two (approximately 140:250), which was opposite the difference of Beef's and lamb's. (2:1)

Do you think that this is a appropriate way to describe these figures??

Please see that picture~(I hoped that I could upload the picture successfully)
I even draw a table for what I saying~

And about "disproportion", can I write...
"There is a disproportion among these 4 different food consumption."

In regard to "Volume", can I use it to describe "People"?
I google this word, some people wrote that " the volume of traffic", "the volume of books"
How could I apply this word in IELTS task 1??

• 
  Cambridge 7 Test2
  

Hello! You're definitely on the right track, and you can use volume to describe people--especially a large group. Your other sentences make sense, but you could also say that the four foods are consumed disproportionately," which might sound smoother. Good luck!

Thank you for your reply!