The line graph presents variations in 
prices
 of three metals from January to December 2014.
It can be observed that all three metals went through the pattern that the Use synonyms
prices
 increased continuously in the first half of the year, followed by a decrease lasting several months and Use synonyms
finally
 a rise until the end of the year. 
In the first two months of 2014, the Linking Words
price
 of copper had the fastest increasing rate (6% and 4%). Use synonyms
However
, Linking Words
this
 was surpassed by the growing rate of Linking Words
Use synonyms
price
 of zinc after March.  The first metal that saw a slight recession around 0.5% of its Add an article
the price
price
 was copper in May. Use synonyms
Linking Words
While in
 the next month, the other two metals Correct word choice
In
also
 witnessed Linking Words
downfall
 in Add an article
a downfall
prices
, with nickel reaching the lowest point of -Use synonyms
3
%.
The decrease of Correct your spelling
-3 
prices
 of nickel and zinc continued from June to October Use synonyms
whereas
 the Linking Words
price
 of copper only suffered decreasing for two months and started to rise again from July at a level of 1%.Use synonyms