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How Annual energy reduced while wind speed is increasing?

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    You can begin reading points 14 to 19 here http://www.wind-power-program.com/turbine_characteristics.htm and http://www.rpc.com.au/pdf/wind4.pdf. – 2017-02-23

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I guess you are thinking that there should be more power output when the wind blows faster. But the third graph doesn't show exactly that.

The first graph shows that about 10-11 m/sec. is the most common wind speed. The third graph shows that the most energy is generated when wind blows about 12-13 m/sec. (even though that is a little above the most common wind speed).

Perhaps more to the point, the third graph shows that, on an annual basis, very little energy is generated when the wind blows more than 25 m/sec. That's because the wind very seldom blows that fast.

If you are interested in how energy output for a windmill increases with wind speed, you need a graph that shows energy output per hour for one windmill when the wind is blowing steadily at each of several wind speeds. But the third graph doesn't show that. (The link provided by @cgiovanardi does something like that.)