| 低风险 | 较低风险 | 中风险 | 较高风险 | 高风险 |
2000 | 41.63% | 31.91% | 14.52% | 7.09% | 4.85% |
2010 | 39.25% | 30.06% | 16.52% | 8.56% | 5.61% |
2020 | 27.46% | 19.26% | 20.16% | 13.50% | 19.62% |