Here are some complete sentences based on the given clues:

1. In 2005, coal accounted for 31% of energy production in France, making it the highest source of energy among the options.

2. The proportion of gas production in France was 30%, which is slightly less than the coal production, which was 31%.

3. In terms of production, petrol made up 20% of energy production, while nuclear production constituted only 10%. This means that petrol production was twice as much as nuclear production.

Feel free to ask for more comparisons or details!