990s ke ngwagasome tšhupamabakeng ya Gregorian wa go thoma ka 1 Pherekgong 990 ya fela ka 31 Manthole 999. Ngwagasome 990s o wela ngwagengkgolo wa 10.
| Ngwagakete: | Ngwagakete 1 |
| Mengwagakgolo: | Ngwagakgolo 9 – Ngwagakgolo 10 – Ngwagakgolo 11 |
| Mengwagasome: | 960s 970s 980s – 990s – 1000s 1010s 1020s |
| Mengwaga: | 990 991 992 993 994 995 996 997 998 999 |
| 990s-tšago tswalanya: |