| Year | Letters | Telephone | Counter | Total |
|---|---|---|---|---|
| 1993 | 146,426 | 254,345 | 542,064 | 942,835 |
| 1994 | 169,939 | 281,049 | 475,980 | 926,968 |
| 1995 | 164,711 | 303,630 | 586,472 | 1,054,813 |
| 1996 | 188,771 | 343,728 | 443,007 | 975,506 |
| 1997 | 232,919 | 382,121 | 347,739 | 962,779 |
| 1998 | 183,252 | 361,082 | 328,212 | 872,546 |