The diagram illustrates the average consumption of consumers on cell phones, national and international fixed-line services in America per year during the period of 2001 and 2010. It can be inferred from this diagram that the number of dollars spent on cell phone services and national fixed-line services had several remarkable fluctuations, while the figure for international fixed-line services almost remained stable.
Between the years 2001 and 2006, it can be seen that national fixed-line services started to have the greatest consumption, about 700$ annually. Followed by international fixed-line services, about 250$, and the figure for national fixed-line service was the smallest, approximately 200$. However, in the next five years, the expenditure on national fixed-line services moderately declined, while there was a significant augmentation in the number of dollars spent on cell phone services. By the year 2006, the figures for cell phone and national fixed-line services met each other at the milestone of 700$. The consumption of international service stayed almost unchanged, at 300$.
During the period of 2006 to 2010, the annual expenditure on cell phone service began to outpass the two other figures by a continuous acceleration. In 2010, the figure has reached approximately 850$. In contrast, the decline in the number of dollars consumed in national fixed-line services seemed to be unchanged. By 2010, there were 400$ dollars spent on cell phone service. The figure for international fixed-line services was almost the same year over year, at the dollars of 300, and was the smallest of the three figures after the 9-year period.