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| Cause | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 |
| Dismissals | 159 | 104 | 112 | 95 | 138 | 132 | 136 | 141 | |
| Breakdown in negotiations | 26 | 24 | 26 | 43 | 47 | 42 | 66 | 40 | |
| Suspensions | 63 | 48 | 56 | 50 | 65 | 42 | 47 | 74 | |
| Termination of services | 99 | 134 | 146 | 96 | 61 | 77 | 84 | 50 | |
| Lay offs | 7 | 5 | 2 | 3 | 3 | 2 | 4 | 2 | |
| Warning letters | 63 | 22 | 12 | 20 | 13 | 19 | 23 | 18 | |
| Retrenchment and redundancy | 4 | 13 | 11 | 11 | 17 | 19 | 14 | 11 | |
| Severance and terminal benefits | 9 | 9 | 9 | 23 | 14 | 15 | 11 | 11 | |
| All payments | 49 | 43 | 46 | 59 | 55 | 76 | 63 | 61 | |
| Conditions of employment | 109 | 107 | 115 | 84 | 110 | 110 | 84 | 133 | |
| Miscellaneous matters | 12 | 8 | 5 | 9 | 12 | 7 | 7 | 6 | |
| Refusal to negotiate | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Delay in negotiations | 3 | 2 | 0 | 1 | 0 | 2 | 0 | 4 | |
| Breach of agreement | 5 | 10 | 23 | 6 | 9 | 10 | 16 | 21 | |
| Total | 608 | 529 | 563 | 500 | 544 | 553 | 555 | 572 |
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