| 1971 | ||||||||||||
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| 1 | --- | 1 | --- | --- | 1 | --- | 1 | 1 | 1 | 1 | --- | --- |
| 2 | --- | --- | --- | 1 | 1 | 1 | 1 | 1 | 1 | 1 | --- | --- |
| 3 | --- | --- | 1 | 1 | 1 | 1 | 1 | 1 | 1 | --- | --- | --- |
| 4 | 1 | --- | --- | 1 | 1 | 1 | 1 | 1 | 1 | 1 | --- | --- |
| 5 | 1 | 1 | --- | 1 | --- | 1 | 1 | 1 | 1 | 1 | --- | --- |
| 6 | --- | 1 | --- | 1 | 1 | 1 | 1 | 1 | 1 | --- | 1 | --- |
| 7 | --- | --- | --- | 1 | --- | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 8 | --- | --- | --- | 1 | 1 | 1 | 1 | 1 | --- | --- | 1 | --- |
| 9 | 1 | --- | --- | 1 | --- | 1 | 1 | 1 | 1 | 1 | 1 | --- |
| 10 | --- | --- | --- | 1 | --- | 1 | 1 | 1 | 1 | 1 | 1 | --- |
| 11 | 1 | --- | 1 | 1 | --- | 1 | 1 | 1 | 1 | 1 | 1 | --- |
| 12 | 1 | --- | --- | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 13 | 1 | --- | 1 | --- | 1 | 1 | 1 | 1 | 1 | 1 | 1 | --- |
| 14 | 1 | --- | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | --- | --- |
| 15 | 1 | --- | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | --- | --- |
| 16 | 1 | 1 | --- | 1 | 1 | 1 | 1 | 1 | 1 | 1 | --- | --- |
| 17 | 1 | --- | 1 | --- | 1 | 1 | 1 | 1 | 1 | --- | --- | --- |
| 18 | 1 | --- | --- | 1 | 1 | 1 | 1 | 1 | 1 | --- | --- | --- |
| 19 | --- | --- | 1 | 1 | --- | 1 | 1 | 1 | 1 | --- | 1 | --- |
| 20 | --- | --- | 1 | 1 | 1 | --- | 1 | 1 | --- | 1 | --- | --- |
| 21 | --- | 1 | 1 | 1 | 1 | 1 | --- | 1 | --- | 1 | --- | --- |
| 22 | 1 | 1 | 1 | 1 | 1 | --- | --- | 1 | 1 | --- | --- | --- |
| 23 | 1 | --- | --- | 1 | 1 | 1 | --- | 1 | 1 | --- | 1 | --- |
| 24 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | --- | --- |
| 25 | 1 | 1 | --- | 1 | 1 | 1 | 1 | 1 | 1 | 1 | --- | --- |
| 26 | 1 | --- | 1 | 1 | --- | 1 | 1 | 1 | 1 | 1 | --- | --- |
| 27 | 1 | --- | --- | 1 | --- | 1 | 1 | 1 | 1 | --- | --- | 1 |
| 28 | 1 | --- | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | --- | 1 |
| 29 | --- | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | --- | 1 | |
| 30 | --- | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |
| 31 | 1 | 1 | 1 | 1 | 1 | 1 | --- | |||||
