|
| Years | P1 | P2 | P3 | P4 | Total |
Length of phases | Base years | 1961-1990 | 15 | 40 | 32 | 50 | 136 |
| periods | 2000-2030 | 13 | 38 | 32 | 48 | 130 |
|
| 2030-2050 | 10 | 36 | 31 | 45 | 122 |
Changes in length |
| 2000-2030 | −2 | −2 | 0 | −2 | −6 |
of phases |
| 2030-2050 | −5 | −3 | −1 | −5 | −14 |