The chart below shows the total number of minutes (in billions) of telephone calls in the UK, divided into three categories, from 1995 – 2002.

The given bar chart illustrates the summation of

minutes

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per

billions

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billion

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of phone calls in the United

Kingdome

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Kingdom

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, separated into three classes, over a 7-year period from 1995 to 2002.

Overall

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, as can be seen, the use of cell

phone

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phones

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for local calls

were

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was

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more than others. Looking more closely at the bar chart,

it is clear that

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, the mobiles and the national and international classes were experiencing their trough with less than five and 40

minutes

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respectively in 1995. All classes increased gradually until 1998.

However

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,

second

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the second

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and third groups were followed

with

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by

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a growth

with

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of

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approximately 50 and 10

billion

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minutes

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respectively, the first class stood stable with about 90

billion

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minutes

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in 1999. The second category continued its trend slowly,

while

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the third category rocketed in a way that the difference between them

decrease

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decreased

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to 15

billion

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minutes

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. On the other side, the first cluster started to decline from 90

billion

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to 70

billion

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minutes

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in 2002

,

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and reached its minimum again.