The given chart demonstrates how people in a particular European country spent money on monthly contract for four kinds of cell phones between January and September in 2002.
Overall, there was an increase in the number of people spending money on domo and lex, with a dramatic rise being seen in the figure for alpha. Significantly, a reverse trend was witnessed in the number of expenditure on sim TX
The total of alpha started at 5 euros in January, before maintaining at this level until June despite a small fluctuation during this period. Followed by a dramatic growth towards the end of the period, peaking at 25 euros. An opposite change was seen in the figure for sim TX, increasing from about 10 euros to roughly 15 euros in the first five months. Subsequently, the number of people spending money on sim TX dropped considerably to just over 5 euros in September.
People spent a great deal of money on monthly contract for domo, at 15 euros in the first month, with a subsequent increase to 25 euros six months later and a final decrease just by 1 euro. Similar change, but to a lesser extent, was experienced in the figure for lex, climbing from north of 10 euros to just under 15 euros throughout the period.