We do a straight trendline from 0 to 100% for contributions.
We do a straight trendline instead of monthly trendlines based on five-year averages (the same approach as the Delivery Indicator) because do not have historical month-by-month data for Contributions.
For each 1% below the trendline, we remove 3 points from the 100 scores.
The traffic light scoring system for this indicator is:
