Based on prior knowledge, it is likely that the recency of blood donation (months since last donation) will have a negative correlation with the likelihood of donating blood again. In other words, if the recency is low, the person is more likely to have donated blood recently and less likely to donate again in the near future. On the other hand, if the recency is high, the person is more likely to have not donated blood recently and more likely to donate again.

Based on this analysis, the following dictionary can be generated:

```json
{
	"yes": [1.0, 2.0, 3.0, 4.0, 5.0],
	"no": [15.0, 16.0, 17.0, 18.0, 19.0]
}
```

In this dictionary, the "yes" class represents individuals who have donated blood, and the "no" class represents individuals who have not donated blood. The list of float values for each class represents typical recency values for those classes. For the "yes" class, the recency values are low (1.0, 2.0, 3.0, 4.0, and 5.0), indicating recent blood donations. For the "no" class, the recency values are high (15.0, 16.0, 17.0, 18.0, and 19.0), indicating less recent blood donations.