| Value | Category | Cases | |
|---|---|---|---|
| 1 | April | 1998 |
8.4%
|
| 2 | May | 2015 |
8.5%
|
| 3 | June | 2009 |
8.5%
|
| 4 | July | 2023 |
8.5%
|
| 5 | August | 1969 |
8.3%
|
| 6 | September | 1966 |
8.3%
|
| 7 | October | 1988 |
8.4%
|
| 8 | November | 1942 |
8.2%
|
| 9 | December | 2017 |
8.5%
|
| 10 | January | 1942 |
8.2%
|
| 11 | February | 1883 |
7.9%
|
| 12 | March | 1948 |
8.2%
|
| 37 | 1 |
0%
|