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

The line chart illustrates the

fluctuation

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prices per month of

copper

,

nickel

, and zink from

January

to December 2014. Units are measured in percentage (%).

Overall

, it can be seen that the change fee of

nickel

was the most rose and fell.

Also

, all metals' starting points were different,

while

they hit relatively the same proportion

at the end

of the year.

Copper

, zinc, and

nickel

had a similar trend that went down

first,

after

January

, and went up until July. The

copper

started at 2% in

January

and decreased to half of it in July. The zink was at 1% in

January

and became below 0% but above -1%.

In contrast

,

nickel

has the highest change cost, at 6%, in

January

. After that, the cost decreased gradually until April, at 1%.

Then

jumped dramatically to -1% in July.

On the other hand

, the three metals increased gradually from July to December.

copper

climbed up for almost twice its proportion.

Moreover

, zinc and

nickel

rose sharply from negative rates to

at

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2% and 1% respectively. In the final period, in December, zinc was the main material that had many changes, followed by

copper

and

nickel

.