The chart depicts the average expense of monthly contract came from four cellular companies in one European country during 12 months in 2012.
Looking at the illustration, it is immediately evident that the avarage cost of 3 companies including Domo, Lex and Alpha significantly increased during a period, wheares the opposite was true for Sim TX.
January witnessed the dominance of Domo company with 15 euros, which outweighed others at this time. From January to May, this figure had a slightly fluctuated and eventually reached at 20 euros. After 3 months, the average expense of Domo unremarkable developed to 25 euros before decreasing to around 23 euros in September. About the Lex firm which accounted for the second point of the rank with about 12 euros in January. After that, the average cost of this company experienced the slightly fluctuation during a period and reached the third position at nearly 20 euros at the end of the year 2012.
Turning to the Sim TX, this corporate witnessed the growth of their cost from 8 euros in January to 11 euros in May before developing rapidly to nearly 15 euros which run over Alpha company at that time. However, this data has a sustanially dropping to only 7 euros in September. About the Alpha firm, in the first time of a period the cost of this company stood at the lowest position with only 5 euros. Although this figure has slightly fluctuation between February and June, it also dramatically grew to 25 euros in September.