This line graph question and answer were provided by a student. IELTS Achieve did not design this question

The graph gives information about the number of spreads (Margarine, low fat & reduced spread and butter) consumed from the year 1981 up to 2007. The units were measured in grams. Overall, the highest consumed spread was butter which started as the most used among the three, whereas low fat and reduced spread were only introduced in 1996, however, all three spreads fluctuated within the end of the given time frame. On the one hand, butter started strong with 140 grams consumed in the year 1981 but gradually decreased as the years progressed until it plummeted to nearly 50 grams used by 2007. Similarly, this can be seen in margarine with almost 90 grams used in 1981 then it slowly decreased in 1986. It reached a plateau in 1991 up to 1996 and gradually decreased reaching 40 grams used in 2007. On the other hand, low fat & reduced spread was introduced in 1996. It gently rose from almost 10 grams used when it started then progressively increased reaching its highest peak in 2001 (80 grams) however like the two other spreads it slowly decreased up until 2007 were it garnered almost 60 grams.