the chart below shows the total number of mintues in billion of telephone calls in the UK divided into three categories

The bar chart illustrates the gross amount of call times (

minutes

in

billion

) of three different categories in the United Kingdom over the period of seven years (from 1995 to 2002).

Overall

,

time

spent on the group Local-fixed

line

is much higher than the other two groups,

while

Mobiels (all calls) shows the minimum

time

consumption throughout the whole analysed stage. Meanwhile,

time

spent on the National and international fixed

line

and

Mobiles

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(all calls) exhibits an upward trend during the entire

time

span,

whereas

a downward trend could be observed on the Local-fixed

line

from 1999 to 2002. In terms of the Local-fixed

line

, the consumed

time

in 1995 was approximately 72

billion

minutes

,

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and

then

continued to rise to the maximum value of 90

billion

minutes

in 1999. After 1999, the number constantly reduced to about 72

billion

minutes

in 2002, just as that of 1995. For National and international-fixed

line

and

Mobiles

(all calls), the amount of call

time

was small in 1995 (roughly 37 and 3

billion

minutes

for National and international-fixed

line

and

Mobiles

(all calls) respectively) but saw an obvious increase trend during the following six years.

Finally

, the values for National and international fixed

line

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and

Mobiles

(all calls) reached 61 and 46

billion

minutes

.