The line graph illustrates the number of inquiries received by the Tourist Information Office in one city over a six-month period, from January to June 2011, via three different methods of communication.
The graph indicates that personal visits showed a sharp increase, enquiries by letter or email declined steadily, and telephone enquiries displayed a fluctuating but upward trend. At the beginning of the period, telephone enquiries were the most common, at about 900, followed by letters or emails at 750, while in-person enquiries were the least used, at just over 400.
Enquiries made in person then rose continuously, surpassing the other two methods in April and reaching nearly 1,900 in June. By contrast, enquiries by letter or email fell gradually to around 400. Telephone enquiries fluctuated during the period, dipping slightly in February, recovering in March, and climbing to about 1,600 in June.
Throughout the six months, the number of enquiries for each method changed at different rates, with in-person and telephone enquiries increasing overall, while letters or emails showed a continuous decline.