The given line graph illustrates the number of complaints received by the complaints department of a single airline over a six-month period in 2009. Overall, the number of complaints fluctuates significantly throughout the period, with a notable peak in the fourth month, followed by a sharp decline towards the end of the period.
In the first month, the number of complaints was relatively low, at just over 100. However, the number began to rise in the second month, reaching approximately 200 complaints. This upward trend continued in the third month, where the number of complaints peaked at around 250.
The most striking feature of the graph is the dramatic increase in complaints during the fourth month, which saw a sharp rise to approximately 400 complaints. This sudden spike represents the highest point in the entire six-month period. Following this peak, the number of complaints sharply declined in the fifth month, dropping to just under 100 complaints, which was the lowest point recorded.
In the final month of the period, the number of complaints rose again, though only moderately, to just above 150 complaints. Despite this slight increase, the complaints remained relatively low compared to the peak in month four.
In summary, the number of complaints varied significantly throughout the six-month period, with a sharp peak in the fourth month and a subsequent decrease in the following months. Overall, the complaints department received the highest number of grievances in the middle of the period, which was followed by a general decline in the latter half of the year.