Here are my stats for Survival Colony Nine. As you recall, I had two rounds of querying (one that resulted in finding my first agent, one that resulted in finding Liza), but I've combined the numbers for ease of reference.
And the numbers are (drum roll please)....
11 requests (11%)
3 offers (3%)
These figures don't reflect some of the details, such as agents who never responded, agents from whom I withdrew my query or manuscript after I accepted an offer, and so on. But the bottom line is, I queried 100 agents, 11% of whom requested the full manuscript (I received no partial requests), and 3% of whom (two the first round, Liza the second) offered representation.
I should also say that I have no idea how representative these numbers are. Kang's numbers, for instance, are much better (more requests, more offers). Other writers' numbers may be worse.
But that's not the point. The point is simply this: it's tough out there. Even successful searches ("successful" in the sense of obtaining an agent) are filled with rejection, anxious waiting, close-but-no-cigar moments, and general misery.
Whaddya gonna do, though? It's the nature of the beast.