The table below gives details of world electricity production by renewable sources in the four years between 2009 and 2012.

The given table illustrates the global electricity generation from six kinds of renewable

sources

,measured in trillion watt hours (

TWh

), from 2009 to 2012.

Overall

, it is evident that all of the given

sources

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sources'

source's

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usage increased throughout the

period

.

While

the most popular field was the hydraulic

sources

, the least popular category was

the

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apply

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solar energy during the

period

. In detail, hydraulic

sources

represented

in

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apply

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the highest numbers over the

period

, in the

beginning

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beginning,

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3329

TWh

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were genereted

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genereted

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generated

by

jydraulic

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hydraulic

sources

and

this

figure gradually increased

ant

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and

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reached

at

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apply

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3663.4

TWh

in 2012. As for solar

sources

,

whereas

this

figure rose more than five times (from 21 to 104.5

TWh

), it had the lowest percentages between 2009 and 2012. The usage of the remaining categories had

also

rose

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risen

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, particularly, wind

sources

almost doubled, it

accounnted

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accounted

for 276.4

TWh

in the beginning and reached

at

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apply

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534

TWh

in

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at

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the end of the

period

. Turning to the category of

bio-mass

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biomass

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and geothermal

sources

steadily increased.