| d N /d S | FEL |  | REL |  |
---|---|---|---|---|---|
 |  | Positive selected | Negative selected | Positive selected | Negative selected |
Before 1984 | Â | Â | Â | Â | Â |
All data | 0.173 | 0 | 29 | 0 | 0 |
After 1984 | Â | Â | Â | Â | Â |
All data | 0.162 | 1 | 100 | N/A | N/A |
Average (10 data sets) | 0.158 ± 0.017 | 1.600 ± 0.843 | 49.500 ± 5.126 | 2.400 ± 5.542 | 24.200 ± 28.389 |