The line graph illustrates how the number of complaints received by the complaints bureau of an airline changed in 2009, from January to June.
Overall, the figures for both complaints in person and by telephone increased, with the former seeing a more dramatic rise, the opposite was true for complaints by email or fax.
The figures for both by telephone and in person ways of complaints followed increasing patterns, albeit to varying degrees. Starting at around 450 in January, complaints made in person increased steadily without any fluctuations from start to finish, and rose to 1,900 complaints at the end of the period. A similar pattern was observed for complaints made by telephone. The figure for telephone complaints dropped to 800 in February, after experiencing a slight rise to over the 1,000 in March. The number of complaints remained steady until April, when the number increased to 1,400 in June.
The complaints made by email or fax, on the other hand, exhibited a downward trend. The figure of email or fax, initially standing at about 790 messages, showed a slight fall to 750 in March. The number stayed steadily around 390 in June, after experiencing a dramatic downfall from March to May