While the total number of SMSes sent each month hovered between 4-7 million, the breakdown according to destination is quite puzzling. You would expect the number of local SMSes to be roughly the same throughout the year, or perhaps rising slowly as SMS technology is becoming more popular. But this is not the case: in January about 6 million local SMSes were sent. In May only 1.5 million (the minimum, shown below in red). Then in December almost 7 million (the maximum, shown below in blue).
The behaviour of the number of SMSes sent internationally is also surprising. Initially I though it would correlate with the tourist seasons, but it doesn't. The maximum was sent during the month of May, when more than 3 million international SMSes (!) were sent. Recall that May is the "low season" for local SMSes! The low season for internations SMSes is October, with only about 38 thousand (!).
There was no explanation for this behaviour in the bulletin, and I could not think of any. If you happen to have a rational explanation of these seasonal patterns, kindly share with us!
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