The line chart illustrates the average monthly consumption of four mobile phone brands (A, B, C, and D) in South American countries, measured in units per 1,000 people over a one-year period.
Overall, Brand A consistently had the highest consumption, while Brand D generally remained the lowest. Notably, Brand C showed a significant upward trend throughout the year, unlike the other brands which displayed more fluctuating or stable patterns.
Brand A started at 420 units in January, peaking at 440 units in August before declining slightly to finish at 415 units in December. Brand B, beginning at 350 units, experienced minor fluctuations but showed a general downward trend, ending the year at 330 units, its lowest point.
In contrast, Brand C began the year with 280 units and saw a steady increase, reaching 335 units by December. Brand D, starting at 210 units, also saw a general rise, peaking at 245 units in August, before falling back to 225 units by the end of the year. Despite these changes, Brand D remained the least consumed brand.