Given is a line graph comparing the proportion of customer complaints over the two-year period in 2015 and 2014 in a specific country.
According to the figure, it is clear that both years experienced fluctuations over the given period.
It is observed that the first month of 2015, customer complaints were at around 35% and decreased gradually over the next 4 months to reach 15%. However, this downward trend increased considerably to 23% in April. In the following 5 months, it declined steadily to 15%. Moreover, September came with a dramatic growth, reaching a peak of 39% in December.
On the other hand, the figure in 2014 stood at 28% in January, while the next months, it dropped suddenly to a mere fifth percent and grew slowly to 15%. Additionally, the index of 2014 year fluctuated over the next 7 months and surged significantly to 22% at the end of the period.