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Sometimes "while" can be explained as "simultaneity", for example, I am doing my homework while she is watching TV.

   In this sentence, "it" might refer to " over 75% of the energy". if we use the subject substitute "it", the sentence would be "while in Germany over 75% of the energy is just over 33%".  This doesn't make sense, therefore, "it" needs its antecedent.

   Personal opinions.

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