The line graph illustrates the figure for complaints sent to the complaints department of a specific airline from January to June. It is clear that the number of complaints sent in person and by telephone tended to increase the entire period. By contrast, using by email or fax was a downward trend over a period of six months.
In the first 2 months, the number of users by telephone declined slightly and then rose again. It stayed consistent 2 next months. In addition, this figure hit a peak in June after continuing to rise, from about 1000 to exactly 1600 at the end of the period. Meanwhile, starting at over 400 complaints in January, the number of complaints in person went up steadily to approximately 800 in March. This figure reached the highest point of over 1800 at the end of the period.
By email or fax, which had the lowest point at nearly 800 in January, then dropped gradually until May. In the final months, the number of complaints remained unchanged of the period.
