The bar graph illustrates the mobile usage in a specific nation according to four different age groups over the course of two years, starting in 1998.
Overall, an increase in the use of phones was observed by the youngest and oldest age groups; however, these groups used their phones least throughout the given period. By contrast, the mobile usage of citizens aged 16 to 30 years old decreased yet remained to be the most significant.
Regarding the use of phones of the youngest and oldest age groups, it started at 2% and 4% in 1998 respectively. However, the former figure climbed slightly over fourfold by 2000, whereas the latter figure witnessed a moderate increase to 10%.
Turning to the remaining age groups, the mobile usage of individuals aged 16 to 30 years old fell remarkably by 9% in 2000 from 53% in 1998. A similar trend was experienced by people who are 31 to 50 years old as their use of phones underwent a decline of 4%, recording 37% in 2000.