30 instances from 7 years

Jan
Feb
Mar
Apr
5
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Jan
Feb
3
Mar
Apr
4
5
May
15
Jun
Jul
21
Aug
Sep
Oct
Nov
Dec

Jan
Feb
4
Mar
Apr
2
May
Jun
10
13
Jul
Aug
6
Sep
Oct
1
Nov
Dec

Jan
Feb
14
Mar
Apr
3
22
May
Jun
Jul
Aug
7
Sep
Oct
3
Nov
19
Dec

Jan
17
Feb
Mar
Apr
4
18
May
4
Jun
Jul
Aug
3
Sep
Oct
11
16
Nov
Dec

Jan
Feb
2
Mar
Apr
May
6
Jun
Jul
Aug
Sep
13
Oct
Nov
5
Dec

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
12
Sep
Oct
Nov
Dec