he pie chart below shows the main reasons why agricultural land becomes less productive. The table shows how these causes affected three regions of the world during the 1990s. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

In 1930, 75% of the labour force in the USA was employed in farming, fishing and foresting

while

only 10% worked in sales and office and trade. At the same

time

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,time

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both the Industrial sector and the technical sector constituted just 2% of the

workforce

each.

This

situation changed only very gradually over the next 20 years, except for the technical

workforce

, which increased more than threefold.

However

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,However

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by

1980

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,1980

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there had been a significant change in the pattern of employment.

While

the farming, fishing and foresting employees had declined in number to 40% of the

workforce

, Industrial employees

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, as well as technical,

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as well as

technical had increased their share to 13% and 10% respectively.

Similarly

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,Similarly

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the sales and office sectors did not increase until 1980. The most dramatic change could be seen by 2000

,

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when the proportion of farming, fishing and foresting works reduced to just 10%

while

the three other major sectors had all increased to over 20% of the

workforce

.