The graph below shows the average monthly change in prices of three metals during 2014. IELTS task1

Cambridge 18 test 4 writing task 1 report writing
The graph below shows the average monthly change in prices of three metals during 2014.
Summarise the information by selecting and reporting the main features, and make comparisons where possible.
From the line graph, we can see the average monthly rise or fall in how much copper, nickel, and zinc cost throughout 2014.
Overall, nickel started with the highest percentage change of the three but ended with the lowest. Zinc started with the smallest change and ended with the highest, and copper prices fluctuated. Prices for all three metals dipped in June.
In January the price of nickel was up six percent, but this dropped to negative three percent in June, ending the year with a percent increase in both November and December. Copper began the year with an increase of two percent, and by May the price was dropping by slightly less than one percent. It rose again, increasing by a percentage point in July, August, and September. Zinc saw its most dramatic increase in February, with three percent, and price fell in June by nearly a percent decrease. The change was negative until October/November when it began to rise again.