The given line chart compares how much four types of cell phones cost for a monthly contract in a European country in the first nine months of 2002.
Overall, there was an upward trend in the annual expense for all types of mobile, except for Slim TX which underwent a gentle decrease. Additionally, the average cost for Alpha surpassed that for Domo to become the highest at the end of the survey.
In January 2002, the average cost of a monthly contract for Domo was the highest at 15 euros, while the opposite was true for Alpha at 5 euros. The figure for Domo climbed significantly and peaked at 25 euros in July, before slightly declining to about 23 euros. On the other hand, a monthly contract for Alpha charges almost unchanged for the first six months, before experiencing remarkable growth to 25 euros at the end of the survey period.
Regarding Slim TX and Lex, the average cost for the former was about 10 euros in the first month, which underwent a fluctuation during the survey period, hitting the lowest point at 7 euros in the last month after peaking at nearly 15 euros in May. Meanwhile, the figure for Lex experienced a slight decrease to 10 euros in the first month, previously going up moderately to the highest point of approximately 18 euros in September.