| 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | |
| Total number | 341 | 160 | 212 | 206 | 151 | 105 |
| by year of construction | ||||||
| up to 1949 | 1 | 0 | 2 | 2 | 2 | 4 |
| 1950 - 1969 | 31 | 8 | 25 | 26 | 28 | 14 |
| 1970 - 1979 | 108 | 59 | 54 | 49 | 48 | 35 |
| 1980 - 1989 | 115 | 40 | 69 | 68 | 65 | 46 |
| 1990 and over | 7 | 8 | 8 | 9 | 8 | 6 |
| Power - total (1000 kW) | 78,78 | 45,11 | 54,31 | 52,41 | 51,95 | 35,01 |
| by year of construction | ||||||
| up to 1949 | 0,00 | 0,00 | 0,38 | 0,38 | 0,38 | 0,60 |
| 1950 - 1969 | 4,16 | 1,78 | 5,08 | 5,39 | 5,59 | 2,90 |
| 1970 - 1979 | 27,65 | 21,16 | 16,88 | 14,75 | 14,42 | 9,64 |
| 1980 - 1989 | 43,92 | 19,13 | 28,91 | 28,41 | 27,61 | 19,07 |
| 1990 and over | 3,05 | 3,05 | 3,05 | 3,48 | 3,95 | 2,81 |
Source: SPS