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

The line graph illustrates the

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of monthly

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in the cost of three different metals, namely nickel, zinc and copper, over the course of 2014.

Overall

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, the percentage of

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in prices compared with the previous month was the highest

initially

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for the first metal and the lowest in the end,

while

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that of the third metal was the opposite.

Furthermore

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, the

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of all three metals dipped over the year, and that of zinc did not decrease as much. In the beginning, the percentage change of nickel based on the previous month was the highest of all at 6%, and zinc

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lowest at 1%. The former witnessed a rapid decrease by 5% in two months, before dipping to -3% in June, the lowest

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of

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among all three metals. It

then

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, after some fluctuations, eventually reached

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one-sixth of its initial

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(1%). The latter surged rapidly by 2% by February, before declining to its lowest

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of -1% in June. After experiencing a fluctuation, it grew to 2%

at the end

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of the period in December. The

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average prices of copper were

initially

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2%.

This

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contribution dropped by first 2/5%, and

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1%, in March and May respectively. It

then

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fluctuated between -0/5% and 0/5%for the next 6 months, prior to a rapid surge to 1/5%

at the end

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of the period.