| Lake size class (ha) | 1962-1968 | 1999-2001 | 2006-2007 | |||
| Lake number | Lake area (ha) | Lake number | Lake area (ha) | Lake number | Lake area (ha) | |
| 0.1 to 1 | 81 | 25 | 42 | 21 | 34 | 20 |
| 1 to 10 | 30 | 104 | 29 | 98 | 28 | 96 |
| 10 to 100 | 6 | 112 | 5 | 110 | 5 | 108 |
| 100 to 1000 | 1 | 181 | 1 | 151 | 1 | 147 |