| 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 |