Each row is an accident year, when losses occurred. Columns show how total payments accumulate over development years. The blank lower-right corner is IBNR (Incurred But Not Reported): future payments the portfolio still owes. Actuaries use the development factors below to project those ultimate costs and set reserves.
Cumulative Paid Losses (MXN)
Pérdidas Pagadas Acumuladas (MXN)
Darker cells = higher cumulative payments. The staircase pattern is expected; older years have had more time to settle.
Development Factors
Factores de Desarrollo
Column-over-column ratios. A factor of 1.50 means losses grew 50% between periods. Factors near 1.00 indicate the year is close to fully settled.