| Total | 409 (100.0%) |
| Planning | Subtotal | 217 (52.9%) |
| Plan, decision and permission | 124 (30.2%) |
| Compensation and contract | 93 (22.8%) |
| Construction | Subtotal | 56 (13.7%) |
| Construction expenses | 18 (4.4%) |
| Delay | 4 (1.0%) |
| Illegal act | 3 (0.7%) |
| Design․budget change | 4 (1.0%) |
| Obstruction and negligence | 9 (2.2%) |
| Materials and subcontracts | 4 (1.0%) |
| Landscaping business operation | 14 (3.4%) |
| Management | Subtotal | 89 (21.8%) |
| Operation management | 47 (11.5%) |
| Usage management | 41 (10.0%) |
| Maintenance | 1 (0.2%) |
| Etc. | 47 (11.5%) |