N

Mean

Std. D.

Ranking

Solar Energy

34

4.47

0.514

1st

Production by natural gas and oils

34

4.41

1.121

2nd

Wind Energy

34

4.13

0.514

3rd

Hydropower

34

2.82

1.185

4th

Production by coals

34

2.72

0.951

5th

Nuclear

34

2.06

1.029

6th