| Value | Category | Cases | |
|---|---|---|---|
| 1 | April | 1992 |
8.5%
|
| 2 | May | 2000 |
8.5%
|
| 3 | June | 1981 |
8.4%
|
| 4 | July | 2001 |
8.5%
|
| 5 | August | 1957 |
8.3%
|
| 6 | September | 1953 |
8.3%
|
| 7 | October | 1985 |
8.4%
|
| 8 | November | 1926 |
8.2%
|
| 9 | December | 2008 |
8.5%
|
| 10 | January | 1939 |
8.2%
|
| 11 | February | 1872 |
7.9%
|
| 12 | March | 1936 |
8.2%
|