| Department 1 | Department 2 | Department 3 | Department 4 | ||||
---|---|---|---|---|---|---|---|---|
(Voluntary) | (Consensus) | (Consensus) | (Compulsory) | |||||
Year-period | n | Use (%) | n | Use (%) | n | Use (%) | n | Use (%) |
1 | 118 | 37 (31.4) | 251 | 214 (85.3) | 225 | 210 (93.3) | 146 | 136 (93.2) |
2 | 127 | 80 (63.0) | 266 | 238 (89.5) | 242 | 222 (91.7) | 132 | 127 (96.2) |
3 | 137 | 81 (59.1) | 302 | 276 (91.4) | 233 | 203 (87.1) | 156 | 153 (98.1) |
4 | 123 | 64 (52.0) | 232 | 208 (89.7) | 237 | 223 (94.1) | 149 | 144 (96.6) |
5 | 128 | 71 (55.5) | - | - | 249 | 231 (92.8) | 186 | 186 (100.0) |
 | 633* | 333 (52.6) | 1,051 | 936 (89.1) | 1,186 | 1,089 (91.8) | 769 | 746 (97.0) |