| Telecommunications Facilities (year-end) | |||||||
| Year | Long Distance | Length of Long Distance Optical Cable Lines (km) | Length of Long Distance Microwave Lines (km) | ||||
| Telephone Lines (line) | Optical Cable Lines | Digital Lines | |||||
| 1978 | 18801 | 13958 | |||||
| 1980 | 22011 | 13958 | |||||
| 1985 | 37551 | 17275 | |||||
| 1986 | 44085 | 18940 | |||||
| 1987 | 53416 | 20282 | |||||
| 1988 | 68460 | 2717 | 493 | 22320 | |||
| 1989 | 87139 | 5670 | 1851 | 26338 | |||
| 1990 | 112437 | 11453 | 3334 | 33626 | |||
| 1991 | 151779 | 23613 | 6490 | 39282 | |||
| 1992 | 234276 | 51352 | 109300 | 14388 | 54418 | ||
| 1993 | 420323 | 162861 | 298045 | 38666 | 64368 | ||
| 1994 | 615809 | 330359 | 518915 | 73290 | |||
| 1995 | 735545 | 484231 | 677672 | 106882 | 79634 | ||
| 1996 | 998287 | 754143 | 965263 | 130159 | 71503 | ||
| 1997 | 1146121 | 935835 | 1139476 | 150754 | 65013 | ||
| 1998 | 1576483 | 1351665 | 1560201 | 194100 | 66518 | ||
| 1999 | 2299447 | 239735 | 65228 | ||||
| 2000 | 2201746 | 286642 | 121947 | ||||
| 2001 | 3394400 | 399082 | 164052 | ||||
| 2002 | 5782200 | 472806 | 191340 | ||||