The line graph presents the average yearly amount of money spent by customer on three types of communication services in America over the period 9 years starting 2010 including cell phone services,international fixed-line services and national fixed-line services.
As is explicitly highlighted in the chart ,it is clear that the annual expense on cell phone services witnessed upward trend ,while the opposite was true for national fixed-line services .Futhermore , the figure for international fixed-line services was lowest during the period .
In 2001, the expenditure on cell phone services stood at around $200,which the lowest figure in the chart that year .However ,this service increased approximately $500 in 2006 .Over the following 5 years marked a turning point when cell phone services catch up with and the exceeded national fixed-line service,after which the gap between the two figure widened steady and reached more than $700
Conversely, the expenditure on the national fixed-line services experienced a downward from initial value of roughtly $700 in 2001, ultimately this figure continuously decrease to about $400 by 2010.Meanwhile ,international fixed-line services began at $400 in 2001 ,maintained stabilityuntil 2004 ,and after that there saw a gradual drop to account for $320 by 2010