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| Year | Electricity generated - hydro (GWh) (thousands) | Electricity generated - thermal (GWh) (thousands) |
|---|---|---|
| 1974 | 15.037 | 3.454 |
| 1975 | 16.497 | 1.889 |
| 1976 | 15.344 | 4.183 |
| 1977 | 14.573 | 5.599 |
| 1978 | 15.503 | 4.705 |
| 1979 | 18.259 | 2.385 |
| 1980 | 19.171 | 1.909 |
| 1981 | 19.483 | 2.195 |
| 1982 | 18.121 | 4.806 |
| 1983 | 19.554 | 4.932 |
| 1984 | 20.173 | 5.283 |
| 1985 | 19.511 | 6.452 |
| 1986 | 21.877 | 4.880 |
| 1987 | 21.709 | 5.543 |
| 1988 | 22.733 | 5.754 |
| 1989 | 22.333 | 5.949 |
| 1990 | 22.953 | 5.833 |
| 1991 | 22.666 | 7.179 |
| 1992 | 20.882 | 8.237 |
| 1993 | 23.258 | 7.164 |
| 1994 | 25.579 | 5.656 |
| 1995 | 27.259 | 5.273 |
| 1996 | 25.713 | 7.140 |
| 1997 | 22.948 | 10.110 |
| 1998 | 25.006 | 8.401 |
| 1999 | 23.221 | 10.124 |
| 2000 | 24.387 | 9.881 |
| 2001 | 22.391 | 12.161 |
| 2002 | 24.970 | 10.871 |
| 2003 | 23.464 | 12.705 |
| 2004 | 26.755 | 10.474 |