1971
 JanFebMarAprMayJunJulAugSepOctNovDec
1 --- --- 1 1 --- 1 1 1 --- 1 --- ---
2 --- --- 1 1 --- 1 --- 1 --- 1 --- ---
3 --- 1 --- --- --- 1 1 --- 1 1 1 ---
4 --- --- 1 1 1 --- --- 1 1 1 1 1
5 --- 1 1 --- 1 1 1 --- 1 1 1 1
6 1 1 1 --- 1 1 1 --- 1 1 1 1
7 --- --- 1 --- 1 --- 1 1 1 --- 1 ---
8 --- 1 1 1 --- 1 1 1 1 1 --- 1
9 --- 1 1 1 --- 1 1 --- 1 1 --- 1
10 1 1 1 1 1 1 1 --- 1 1 --- 1
11 --- 1 1 --- 1 --- 1 1 --- 1 --- 1
12 --- 1 1 --- 1 1 --- --- --- 1 --- ---
13 --- 1 1 --- --- 1 1 1 1 --- 1 1
14 1 1 1 --- --- --- --- 1 1 1 1 1
15 --- 1 1 1 --- 1 1 1 --- 1 1 ---
16 1 1 1 1 --- 1 1 --- 1 1 1 ---
17 1 --- --- --- 1 --- --- 1 --- 1 --- ---
18 1 --- 1 1 --- --- --- 1 1 --- 1 1
19 1 --- --- 1,2 --- 1 --- --- 1 1 --- 1
20 1 --- --- --- --- --- 1 1 1 --- 1 1
21 1 --- 1 1 --- 1 1 1 --- --- 1 1
22 --- 1 --- 1,2 1 --- --- 1 --- --- --- ---
23 1 1 --- 1 1 1 --- 1 --- --- --- 1
24 1 1 1 --- --- 1 --- --- 1 --- --- ---
25 1 1 --- 1 --- --- --- 1 1 --- --- 1
26 --- 1 --- 1,2 1 1,2 --- --- 1 1 1 1
27 --- 1 --- --- 1 1 --- --- 1 1 1 ---
28 --- 1 1 1 1 --- --- --- 1 --- 1 ---
29 ---   1 1 --- 1 --- --- 1 --- 1 1
30 1   1 1 --- 1 --- 1 1 1 1 1
31 1   1   ---   --- 1   1   ---