The line graph illustrates the monthly differences of prices of three metals in 2014.
Overall, it is clear that nickel started the year with the highest change in cost but it experienced serious fluctions, which made it the last in the list at the end of the period. While copper domanstrate a steady performance during the timeline, rate of zinc had ups and downs at certain periods of the year, finishing the year with the top rank.
At the beginning of 2014, while nickel accounted for 6% , percentages of zinc and cooper were close to each other, which were 1 and 2, respectively. In the period until march, nickel showed a sharp decline to 1% and then, continued at the same rate for the next 2 months. However, its stable state had a decrease again in the amount of 4% in june. In the following four months , change in the price of nickel went up to -2%. Its increase kept on until reaching 1% and finally, it completed the year as the lowest, compared to other two metals and with the same percentage.
For cooper and zinc, they proceeded with relatively same rates at the start of the 2014. As zinc increased to 3% until february, copper made a slight decrease between january and june, which is a little above than 0%. After that, percentage of zinc started to go downwards up to june and went below from copper with the -1% at the same time. Zinc continued with nearly same rate for next four months and then, experienced a upward trend to 2%, becoming the highest among other two metals. In the same timeframe, copper exhibited an increase to 2% and closed the year as second with slightly higher than 2%.