Estimated and imputed year-to-year retention rates (Y2YRR) and cumulative retention rates by year for authors based on start year and number of continuous publishing years^*.

*Retention rates for future years that have been estimated using year-to-year retention rates (Y2YRR) from the earlier data are shown in bold type. Estimated (by extrapolation) numbers of authors who will have uninterrupted, continuous presence for 16 years (UCP-16-births) are listed at the bottom by start year.