The line graph illustrates the monthly variations in costs of nickel, copper and zinc in 2014, on average.
Overall, nickel started at the top but ended with the lowest price among the three, however, zinc started with the lowest but ended up having highest at the end, and prices of copper exhibited fluctuations. Moreover, the prices of all three metals dipped in the months of june and october.
Nickel began with the 6% monthly prices in january but dramatically declined up to -3% by the month of june, and after further fluctuations becane stable at 1% in november and december. Similarly, copper started with a 2% price change but decreased to -0.5% by june, however, after that it demonstrated to increase and a fluctuate a little but at a 0.5% monthly cost change at the end of the year. Lastly, zinc dramatically inclined from a start of 1% to a 3% change by february but started to decline till june, nevertheless, it inclined to a final 2% by the end of december.