Table 15.1 Distribution of lemmas in BoE
| Number of items | Percent age of BoE | Approximate rate of occurrence |
| top 10 | 23.5 | 8,000+ occurrences per million |
| top 100 | 44.9 | 1,000+ per million |
| top 1,000 | 68.5 | 100+ per million |
| top 10,000 | 88.9 | 5+ per million |
| top 25,000 | 92.5 | 1+ per million |
| top 100,000 | 94.5 | 1+ per 20 million |