The given line graph illustrates the proportion of the price changes of copper, nickel and zinc in 2014 between January and December.
Overall, fluctuations have been experienced in prices of each three materials during the given period. There were downward trends for both copper and nickel average prices change from January to May, whereas first the figure of Zinc increased from 1% to 3% in February and then decreased constantly until June at 1%. The change in price remained steady between July and September for each three materials. The amount of nickel and copper price change were at the highest level in January by 6% and 2% respectively, while the peak level of zinc price change has been seen in February by 3%. On the other hand, the lowest price change of nickel and one of the two lowest price changes of copper and zinc were in June.
While the figures of nickel and zinc rose dramatically from -2% to 1% and %-1 to over 1% respectively, the percentage for copper remained constantly at slightly below 1% from October to November. The nickel and zinc price change declined sharply from May to June in a similar way, but the percentage of was constant during this period.
