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==== Example ====
==== Example ====
For a particular stakeholder group, at the end of Year 1 the count is 100 and at the end of Year 2 the count is 110. There are 10 new entrants in Year 2, so Cohort 1 is 100 and Cohort 2 is 10.
For a particular stakeholder group, at the end of Year 1 the count is 100 and at the end of Year 2 the count is 110. There are 10 new entrants in Year 2, so Cohort 1 is 100 and Cohort 2 is 10.
Imagine that the count drops to 99 at the end of Year 3. This would be a 10% reduction compared to the count at the end of the previous year (99/110 - 1). There are no new entrants in Year 3, so Cohort 3 = 0. Cohorts 1 and 2 are both multiplied by 0.9 (1 - 0.1), so Cohort 1 shrinks from 100 to 90 (100*0.9) and Cohort 2 shrinks from 10 to 9 (10*0.9). Combined, the sum of the reductions in Cohort 1 and Cohort 2 is 11 (10 + 1), which equals the reduction from 110 to 99 in the stakeholder count. More stakeholders left Cohort 1 than Cohort 2 because Cohort 1 is bigger. In Year 4, if the stakeholder count drops again, the new reduction would be applied to the remaining counts from Cohorts 1 and 2 (not their initial counts). In other words the reductions are applied cumulatively (i.e., they "stack").
Imagine that the count drops to 99 at the end of Year 3. This would be a 10% reduction compared to the count at the end of the previous year (99/110 - 1). There are no new entrants in Year 3, so Cohort 3 = 0. Cohorts 1 and 2 are both multiplied by 0.9 (1 - 0.1), so Cohort 1 shrinks from 100 to 90 (100*0.9) and Cohort 2 shrinks from 10 to 9 (10*0.9). Combined, the sum of the reductions in Cohort 1 and Cohort 2 is 11 (10 + 1), which equals the reduction from 110 to 99 in the stakeholder count. More stakeholders left Cohort 1 than Cohort 2 because Cohort 1 is bigger. In Year 4, if the stakeholder count drops again, the new reduction would be applied to the ''remaining'' counts from Cohorts 1 and 2. In other words the reductions are applied cumulatively (i.e., they "stack").
==== Technical explanation ====
==== Technical explanation ====
