Zones | January to March | April | May to July | August to November | December |
North (N) | 1 | 0.9 | 0.9 | 0.9 | 1 |
Centre | 1 | 1+10%N | 1 | 1+10%N | 1 |
South | 1 | 1 | 1+10%N | 1 | 1 |