IELTS Task 1. Could you please correct my notes? Thank you in advance. Please help me kindly.

The line graph demonstrates the differences in the amount of different meat consumed in a European country during the time period from 1979 to 2004.
As can be clearly seen from the given data, from 1979 until the mid-1980s, the amount of fish consumed plunged [dropped / declined] negligibly from around 70 grams per person weekly to slightly under 50 grams, after which it leveled out at the same rates.
With regards to the consumption of lamb meat, overall, there was a declining trend in the lamb consumption from 150 grams in 1979 to slightly over 50 grams per person weekly in 2000, while chicken consumption soared abruptly from 150 grams to over 250 grams, representing a two-fold increase.
As for the beef consumption, in the first two years, consumers who purchases of beef meat plummeted sharply [purchases declined, not consumers], [after which this figure grew tremendously to slightly under 200 and 50 grams?]. From 1984 onwards, there was a plunged drop in the consumption of beef meet, although the numbers showed some fluctuation in this regard. By 2004, it hit its lowest level, at around 100 grams.
To conclude, it is clear that chicken meat gained the most popularity among the four different types of meat listed.

- 'Plunged negligibly' is an oxymoron. 'Plunged' implies a very steep decline, almost a vertical line. 'Negligibly' means it didn't change much at all.

-We never say 'lamb meat', just 'lamb'. Likewise, use 'beef' and 'chicken'.

-I'm not sure what you meant to say with the underlined sentence, sorry. I don't think you meant to say 'grew'?