The line graph illustrates the median monthly price up and down of 
three
 metals Copper,Nickel and Zinc in 2014.
Use synonyms
Overall
,Copper and Nickel Linking Words
prices
 fell  in the given period,Use synonyms
while
 Zinc Linking Words
prices
 went up.
On the one hand,Nickel Use synonyms
prices
 started from 6% in January and significantly went down to -3% within June,which was the lowest point.After that,Use synonyms
prices
 rose to minus one per cent and stayed there for the next Use synonyms
three
 months.Use synonyms
Finally
, Linking Words
prices
 ended the Use synonyms
year
 on a positive note(1% increase),which was the lowest among all Use synonyms
three
 metals.Copper started the Use synonyms
year
 at 2 per cent and gradually went down to -.5% within  four months,which was the lowest point.After that,it rose  steadily and ended the Use synonyms
year
 with an almost 2% increase rate.
Use synonyms
On the other hand
,Zinc Linking Words
prices
 started from 1% in January,which was the lowest among all and after February significantly went down and ended June at -1%,which was the lowest point.After that,Use synonyms
prices
 rose to -.5% per cent and stayed there for the next Use synonyms
three
 months.Use synonyms
Finally
, Linking Words
prices
 ended the Use synonyms
year
 on a positive note(2% increase) which was the highest among all.Use synonyms