| Material | Anther exposure rate (%) | Degree of exposure (%) | Fullness | Overview | ||||||
| 2007 | 2008 | Mean Value | 2007 | 2008 | Mean Value | 2007 | 2008 | Mean Value | ||
| Datong 27 | 76.88 | 76.96 | 76.92 | 100 | 100 | 100 | high | high | high | good |
| Datong 29 | 79.73 | 78.26 | 79.00 | 100 | 100 | 100 | high | high | high | good |