The provided line graph illustrates the average monthly variations in the prices of copper, nickel, and zinc throughout the year 2014.
Overall, the prices of copper, nickel, and zinc fluctuated throughout 2014, with varying degrees of changes observed for each metal.
At the beginning of 2014, copper and zinc started with marginal price changes at 1% and 2% respectively, while nickel began with the highest percentage change at 6%. Subsequently, all three metals experienced gradual declines until June, reaching their lowest points with nickel at -3%, zinc at -1%, and copper at -0.5%. However, they showed a minor recovery in July, with nickel at -1%, zinc at 0.5%, and copper at 1%. These values remained relatively stable until September, followed by a slight decrease in October before returning to levels similar to the start of the year. Notably, nickel witnessed a significant drop to approximately 1-2% in comparison to the other metals.
In conclusion, June marked the lowest price changes for copper, nickel, and zinc, with nickel experiencing the most substantial decrease among the three metals throughout the year 2014.