the graph below shows the average monthly change in the prices of three metals during 2014. summarize the information by selecting and reporting the main features and make comparisons where relevant.

This

is the time series of the monthly average

price

change

of three materials in 2014. The graph explains the percentage of

price

change

compared with the previous month.

For example

, the chart shown in February is the percentage of

price

compared to January and so on. Three materials explained in the

line

chart are copper, nickel, and zinc, which are drawn in a dotted

line

with a white button, a straight bold

line

with a black button, and a straight light

line

with an x-letter button, respectively. In the first four

months

, copper had positive changes at 1 to 2%. The next two

months

they had a decreased

price

at below minus 1% and

then

went up again in the next semester with a 0.5 to 2%

price

change

. In the meantime, nickel and zinc had a relatively similar pattern. From January to May, they had an increased monthly

change

of prices and went down from June to October. After that, they got another increase in average prices two

months

ahead. In summary, nickel and zinc only had two different trends, happening in February and December.

While

copper seemed to have a more constant increase in its monthly average

price

in ten

months

, accumulatively, in 2014.