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

The line chart illustrates the

percent

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per cent

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difference

in monthly prices of three types of metals throughout 2014.

Overall

, the

percent

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per cent

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difference

in monthly price had experienced a marked decrease in two types of metals and others had slightly increased. In detail, nickel, which is the highest percentage

difference

at the beginning of the

year

, had decreased dramatically from 6% to the lowest point of -3% in June, before

finally

risen

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rising

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gradually to 1%

at the end

of the

year

.

On the other hand

, there was a gradual fall in Copper’s price from 2% in January, remained constant at 1% in July to September, and

then

slightly increased to around 1.8% in December.

However

,

while

the other two types of metal had decreased in importance, the opposite was true in the case of Zinc. The

percent

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per cent

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difference

in monthly price stood at 1% at the beginning of the

year

, before

increased

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increasing

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to 2%

at the end

of the

year

. Zinc had reached a high of 3% in the second month, before

decreased

Wrong verb form

decreasing

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gradually to -1% in the middle

year

and slightly increased to the end of the

year

.