| Year | Supplied water MCM | Lost water % | Technical water loss % |
| 1984 | 87 | 54.3 | 27.5 |
| 1985 | 93 | 54.3 | 27 |
| 1986 | 134 | 54 | 26.8 |
| 1987 | 150.3 | 54.4 | 26.6 |
| 1988 | 164.5 | 55.8 | 26.9 |
| 1989 | 170.1 | 56.3 | 27.8 |
| 1990 | 178.6 | 58.5 | 26.8 |
| 1991 | 178.5 | 56.2 | 26.7 |
| 1992 | 208.1 | 60.8 | 25.1 |
| 1993 | 218.6 | 57.8 | 26.7 |
| 1994 | 219.9 | 55.5 | 24.4 |
| 1995 | 246.2 | 58 | 26 |
| 1996 | 242.3 | 55.2 | 22.9 |
| 1997 | 239.8 | 54.7 | 22.9 |
| 1998 | 241.5 | 56.3 | 23.5 |