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

The given table illustrates

production

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the production

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of electricity by renewable sources in 4 periods in Trillion Watt Hours (TWH)

Overall

, the vast majority are host to

hydraulic

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hydraulics

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throughout the given time and all of them saved their position except geothermal which was overtaken by solar

at the end

.

To begin

with, the bio-mass and wind had

the

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approximately similar

figure

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In 2007, before wind

has

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increased

total

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in total

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to have

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in 2011 . whilst bio-mass showed 307.5. The others, geothermal and solar, had the lowest sum . 67.4 and 21 releavently. In the end, in 2012 both of them had added , first of them

has

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increased by 70.4 .

although

, the second one multiplied his number

for

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5 times reaching 104.5. As mentioned before . hydraulic makes up the largest sum in 2009 . Between 2009-2010 it

has

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achieved 3514

by

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representing the biggest growth among renewable sources

In addition

, the highest number was given by him ,obviously , in 2012 with

the

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total

3653.4

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of 3653.4

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and having more than

overall

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of

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others