How is the cumulative saving percentage calculated?

Publication: the 25/10/2019

The percentage reported corresponds to the cumulative savings of the past months divided by the average annual consumption.

Why divide by annual consumption? To “stabilise” the result, since we have seen variations in monthly profits of +20 to -20%, perhaps even more, from month to month, the sum of which would not have made the underlying trend visible. 

Example:

The bronze medal is for savings of 10%!