the graph below show the average monthly change in the prices of three metals during 2014

The line graph illustrates the

percentage

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of how prices of three metals

change

Wrong verb form

changed

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every month in 2014.

Overall

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, all the

proportion

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proportions

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of metals witnessed a downward trend in

an

Correct article usage

the

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entire period, except the figure for zinc observed a growth trend . The

percentage

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of nickel made it the most significant surge. In January, at the top spot is the

percentage

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of nickel, which stands for 6%, followed by the figure for copper at 2%. At the bottom of the list is zinc, which had the data of 1%. Take a look at the chart, the proportion of nickel registered a plummet to approximately minus 3% in the next 6 months,

then

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rose to 1% in November and

keep

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kept

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its position till the end of a period.

In contrast

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,the proportion of zinc rose significantly to 3% in February, before

fell

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falling

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to minus 1% in the next 4 months,

then

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it went up to 2% in the

last

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month of 2014. Meanwhile, the

percentage

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of copper recorded a downward trend to 0% in June,

then

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rose

up

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apply

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slightly to about 1.5%

at the end

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of the period.