| 991 | X | 1 | = | 991 |
| 991 | X | 2 | = | 1982 |
| 991 | X | 3 | = | 2973 |
| 991 | X | 4 | = | 3964 |
| 991 | X | 5 | = | 4955 |
| 991 | X | 6 | = | 5946 |
| 991 | X | 7 | = | 6937 |
| 991 | X | 8 | = | 7928 |
| 991 | X | 9 | = | 8919 |
| 991 | X | 10 | = | 9910 |
| 991 | X | 11 | = | 10901 |
| 991 | X | 12 | = | 11892 |
| 991 | X | 13 | = | 12883 |
| 991 | X | 14 | = | 13874 |
| 991 | X | 15 | = | 14865 |
| 991 | X | 16 | = | 15856 |
| 991 | X | 17 | = | 16847 |
| 991 | X | 18 | = | 17838 |
| 991 | X | 19 | = | 18829 |
| 991 | X | 20 | = | 19820 |