[Update] Power mix update & historical values

[grenzbotin]

Goal: Update the countries' power mix while keeping historical values into account.

A year flews by and there are new country based power mix numbers that need to be taken into consideration. As historical values got introduced in one of the recent versions, a power mix update should take it into consideration.

Link to climate transparency report: https://www.climate-transparency.org/g20-climate-performance/g20report2022#1531904804037-423d5c88-a7a7