The experience points is a single number that represents the results of
your work over the last ten seasons. The calculation of the experience
points based on two indicies. First, is the evalution of your work
at the club by your board and second is the degree of difficulty,
which is represented by the strength of the league your team is playing in.
The seasons experience points are weighted for the calculation of total points.
The further in the past the season, the less the influence the value
of experience points has on the experience point total.