As there are several types of graphs used in a task 1 essay, the summary presentation should use a graph type identifier (line, row bar, column bar, etc.) for specific image reference purposes. That will help the summary presentation achieve a clearer pre-report analysis clarity. While it is definitely easier to refer to "10 years" but, it is too simplistic and will not help increase the LR score.Try to use a more advanced alternate word. "Decade" is the go to alternate but other references like decennary would also work. Since this is a reporting essay, more complex vocabulary should be present.
in the year
This should reference a steady decline in measurement so "by the year " would have been the more appropriate measurement reference phrase. At this point, it has become clear to me that the writer needs more LR and GRA skills development.