| 1999 | |
|---|---|
| Homa Bay | 25.1 |
| Siaya | 24.4 |
| Migori | 22.9 |
| Kisumu | 21.6 |
| Busia | 20.6 |
| Vihiga | 15.3 |
| Kakamega | 14.3 |
| Kitui | 13.9 |
| Makueni | 13.9 |
| Kwale | 13.7 |
| Machakos | 13.1 |
| Tana River | 12.9 |
| Kilifi | 12.7 |
| Lamu | 12.6 |
| Mombasa | 12.3 |
| Bungoma | 12.3 |
| Kiambu | 12.2 |
| Taita Taveta | 12.0 |
| Marsabit | 11.8 |
| Isiolo | 11.7 |
| West Pokot | 11.4 |
| Nakuru | 11.2 |
| Nandi | 10.6 |
| Muranga | 10.3 |
| Kericho | 10.3 |
| Nyeri | 9.7 |
| Kirinyaga | 9.6 |
| Nairobi | 9.3 |
| Samburu | 9.3 |
| Trans Nzoia | 9.3 |
| Baringo | 9.0 |
| Embu | 8.8 |
| Narok | 8.3 |
| Nyandarua | 8.1 |
| Turkana | 8.1 |
| Kajiado | 8.0 |
| Laikipia | 7.9 |
| Garissa | 7.7 |
| Uasin Gishu | 7.6 |
| Mandera | 7.3 |
| Bomet | 7.1 |
| Wajir | 6.7 |