The graph showcases the variation in the percentage change of the cost of a metal compared to the previous month for each month throughout 2014. Overall, the percentage variation of prices compared to the previous month was low and sometimes even negative for nickel. Meanwhile, copper and zinc generally had the most variation in prices, which lasted for 5 months for each metal in the year 2014.
There was no month where a percentage change in price from the previous month had been zero, indicating that prices fluctuated each month for all three metals. Additionally, for 3 months in the year 2014 ( july, august and september) the percentage variation in prices of a metal compared to the previous month stayed fixed. It was -1, -0.5 and 1 (in percentage) for nickel, zinc and copper respectively. A similar feature is seen for two different months, march and april, where the percentage variation in comparison to last month is stagnant for copper and nickel, which is 0.5 and 1 respectively.
Moreover, the most drastic percentage differences in costs compared to the previous month is seen in nickel, whereby the price increase is 6 percent for january and -3 percent for june.
