Estimated and imputed year-to-year retention rates (Y2YRR) and cumulative UCP rates for authors based on ending year and number of continuous publishing years previous to ending*.

*UCP rates for earlier years that have been estimated by extrapolation using year-to-year retention rates (Y2YRR) from the more recent data are shown in bold type. Estimated (by extrapolation) numbers of authors who ceased publishing in the ending year after having published continuously for 16 years are listed at the bottom of the table.

采用近年数据的逐年留存率（year-to-year retention rates, Y2YRR）通过外推法估算得到的早期UCP费率，已以加粗字体标注。通过外推法估算的、连续发表论文满16年后于终止年份停止发表的作者人数，已列于该表格底部。