1991
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
1	---	1	1	1	---	---	1	1	---	---	---	---
2	1	---	---	1	---	---	1	1	---	1	---	1
3	1	---	1	---	---	1	1	---	1	---	---	1
4	1	1	1	1	---	---	---	---	1	1	---	1
5	---	1	1	1	---	---	1	---	1	---	1	1
6	---	1	1	---	---	---	---	---	---	---	1	1
7	---	1	1	---	1	1	---	1	---	---	---	1
8	---	1	---	1	---	---	1	1	---	---	---	---
9	1	---	---	---	---	---	1	---	1	1	---	1
10	1	---	---	---	---	1	1	---	1	---	---	1
11	1	1	1	1	---	---	1	---	1	1	1	---
12	---	1	1	1	1	---	1	---	1	1	1	1
13	---	1	---	---	1	---	---	---	1	1	1	1
14	1	---	---	1	1	1	---	1	---	1	1	---
15	1	---	---	1	1	---	1	---	---	1	---	1
16	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	---	---	---
21	---	1	1	---	1	1	---	---	---	1	1	---
22	1	1	1	1	---	---	1	---	---	1	---	---
23	---	---	---	1	---	---	1	---	---	1	---	1
24	1	---	---	1	1	---	1	---	---	---	---	1
25	---	1	1	1	---	---	1	---	1	1	1	1
26	---	1	1	---	---	1	---	---	1	---	1	1
27	---	1	1	---	1	1	---	1	1	---	---	1
28	1	1	1	---	---	---	---	---	---	1	---	1
29	1		1	1	---	---	1	---	---	---	1	1
30	1		---	---	1	---	1	1	---	---	1	1
31	1		---		---		1	---		---		1