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

In the line chart below, the share of the price changes of three metals including copper, nickel and zinc is shown in the year 2014.

Overall

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, the share of price change of Nickel and Copper dropped compared to their initial number,

while

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that of zinc increased slightly over the period. Over the first 2 months of 2014, both Nickel and Copper experienced a fast drop by 5% and 1.5% respectively. Both of them remained steady until April.

Then

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the former fluctuated between 1% and -2% and the latter between -.5% and .5% until October, before surging to 1% and 1.5% respectively until the end of the period. In the first month of the year, zinc increased by 2%, before dipping to -1% in June. It

then

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grew to -.5%, before remaining steady for the next 2 months. It

then

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experienced an increase to 2%

at the end

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of the period.