1977
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
1	---	---	---	---	---	---	---	---	1	1	1	1
2	---	---	---	---	---	---	---	---	1	---	---	1
3	---	---	---	---	---	---	1	---	1	---	1	1
4	---	---	---	---	---	---	---	---	---	---	---	1
5	---	---	1	---	1	---	---	1	1	---	---	1
6	---	---	---	1	---	1	1,2	---	1	1	---	1
7	---	---	1	---	---	1	---	---	1	1	1	1
8	---	---	---	---	1	---	1	---	1	---	---	1
9	---	1	---	---	1	1	---	1,2	---	1	---	1
10	---	1	1	---	1,2	1	1,2	---	1	1	1,2	1
11	---	1,2	1,2	---	1	---	1	1,2	---	---	1	1
12	---	---	---	1	1	---	---	---	1	1,2	---	---
13	---	1	---	---	---	---	1	1,2	1	1	1,2	1
14	1	1	---	1	1	1	---	1	1	---	---	---
15	---	1	---	---	---	---	---	---	1	---	1,2	---
16	---	1	---	1	1	---	---	1	---	1	---	1
17	---	1	---	---	1,2	---	---	1	---	1	---	---
18	1	1	---	---	---	---	---	1	---	1	1	1
19	---	---	---	1	---	---	---	1	1	---	---	1
20	---	1	---	1,2	---	---	---	1	1	1,2	---	1
21	---	---	---	---	---	---	---	1	---	1	---	1
22	---	---	---	---	---	---	---	1	1	---	---	1
23	1	---	---	1	---	---	---	---	1,2	1,2	1	1
24	---	1	1	1	---	1	1	1	1	---	1	---
25	---	---	---	---	---	1	1	---	---	---	---	1
26	1	---	1,2	---	---	1	1	1,2	1,2	---	---	1
27	---	---	---	---	---	---	1	---	---	---	---	1
28	---	---	1	1	---	---	---	1,2	1	---	---	1
29	---		---	1	---	---	1	---	1	---	---	---
30	---		---	---	---	---	1	---	1	---	---	1
31	---		---		---		---	1		---		---