1987
 JanFebMarAprMayJunJulAugSepOctNovDec
1 --- --- --- --- --- --- --- --- --- 1 1 1
2 --- --- 1 1 1 1 --- --- --- --- 1 1
3 --- --- 1 1 1 --- --- --- 1 --- 1 ---
4 --- --- 1 1 1 --- --- --- 1 --- --- 1
5 --- --- 1 --- 1 1 --- 1 1 1 --- ---
6 --- --- 1 1 1 --- --- 1 1 1 1 ---
7 --- --- --- --- 1 --- 1 1 --- --- --- 1
8 --- --- --- 1 --- --- 1 1 --- 1 --- ---
9 --- --- --- 1 --- --- 1 1 1 --- 1 1
10 --- --- 1 --- --- --- --- 1 --- --- 1 1
11 --- --- --- --- 1 --- --- 1 --- --- 1 ---
12 --- --- --- --- --- --- --- 1 --- --- 1 ---
13 --- --- --- --- --- --- --- 1 --- 1 1 ---
14 --- --- --- 1 1 1 --- 1 1 1 --- 1
15 --- --- --- --- 1 1 --- 1 1 --- --- ---
16 --- --- 1 1 --- --- 1 --- 1 1 1 1
17 --- --- 1 1 --- --- 1 1 1 --- 1 1
18 --- --- 1 1 --- 1 --- 1 1 --- 1 ---
19 --- --- 1 --- --- 1 --- --- 1 1 1 ---
20 1 --- --- --- --- --- --- 1 1 1 --- ---
21 --- --- 1 1 1 --- 1 --- --- 1 --- 1
22 --- --- 1 1 --- 1 1 --- 1 1 --- 1
23 1 --- 1 --- --- --- 1 --- 1 1 --- 1
24 --- --- 1 1 --- --- 1 1 1 --- --- 1
25 --- --- 1 1 --- 1 --- --- 1 --- --- ---
26 --- 1 1 1 1 --- --- 1 1 1 1 ---
27 --- 1 1 1 1 1 1 --- --- 1 1 ---
28 1 --- 1 --- 1 1 --- --- 1 1 --- ---
29 ---   1 --- 1 1 --- 1 1 1 --- 1
30 ---   1 --- --- 1 1 --- --- 1 1 ---
31 ---   1   ---   --- 1   ---   ---