Cancellation typically occurs on a graduating scale: 15% for year 1, 15% for year 2, 20% for year 3, 20% for year 4, 30% for year 5. These percentages were based on the original debt amount. Thus after 3 years of service, one would have 50% of their original debt cancelled.
Cancellation is implemented progressively over time: a 15% reduction in year 1, followed by 15% in year 2, then 20% in year 3 and so on until year 5 where there's a 30% cancellation. These percentages are based on the original debt amount. After three years of service, one would have 50% of their initial debt cancelled.