The given line chart depicts the quantity of messages from different sources to Tourist Information Office in one city in 2011 from January to June.
It can be clearly seen that from January till the end of March the number of enquiries by telephone and by letters was fluctuating slightly, however, was roughly stable, Moreover, after that while the former has rapidly increased on 200, the latter has significantly diminished from 600 to 200 requires.
It is obvious that in person enquiries were at the bottom of the comparison and were equal 400, despite this, it has tripled over 6 months. It also should be mentioned that the overall difference between the first and the second type of appeals was about 100, but the third one appeared to be 6 times less.
Overall, the number of all requires was changing during the given period of time independently from each other.
