The line graph compares three metals in terms of cost changes per month in 2014.
Overall, the three metals, copper, nickel and zinc, experienced different trends over the period. While the nickel price has experienced a sudden fall and a gradual rise, the changes in the prices of copper and zinc have shown a moderate fall and a slight increase with fluctuations.
As the graph shows, the nickel price dropped sharply from 6% change in January to 1% change in March, and then leveled off at almost 1% change in the spring period. Then it fell steadily to -3% in June, before rising in July and remaining unchanged until September. From September till November it decreased to -2%. In November, that particular month, it remained stable at the point of 1% until the end of the year.
With regard to the price of copper, it experienced a gradual fall and consequently a moderate growth, remaining almost constant in the period from July to September at the point of 1%.
The price of zinc has not rapidly fluctuated, starting at around 1 in January and ending at around 2% at the end of December. The highest point for zinc was 3 % of change in February which included a slight difference in price change of nickel.