The diagram illustrates the variations in the total number of minutes (in billions)of three types of telephone calls in Britain over an 8-year period between 1995 and 2002.
In 1995, local-fixed line calls were the most popular of these types of telephone calls, with about 72 billion minutes spent by UK residents. The figure for national and international-fixed line calls was significantly lower, at around 36 billion, while merely 2 billion were spent on mobile calls.
The use of local-fixed line calls was the highest throughout the period, jumping to 90 billion in 1999. However, it had fallen back to 72 billion by 2002, returning to its initial level. The use of national and international-fixed line calls experienced a steady increase, growing to 61 billion, though the pace of growth decelerated in the final two years. In comparison, there was an increase in the usage of mobile calls, but this rise was much more pronounced compared to that of national and international-fixed line calls, ascending to 46 billion in 2002, with the most conspicuous growth occurring between 1999 and 2002, marked by a staggering rise of 30 billion minutes.
To sum up, local-fixed line calls showed some fluctuation in usage, while the popularity of the other two types of calls increased over the period. It is also evident that local fixed-line calls were still the most popular call type in the year 2002.