We need to keep in mind that prefixes tend to be released in reverse order because the "oldest" notes in a batch get put in the back of the vault while the "newest" are toward the front, and when taking notes out of the vault, they start from the front. CBN has been prolific in their printing of Journey notes, so this is a common occurrence. That's not to say that all of the HPAs went to the back of the vault. I'm sure a few went out the door, and that trickle has been detected in circulation. It takes a couple of years to determine if a prefix is actually scarce or not. But anyhow, it's not really surprising that HPAs have been few and HAA's have been plenty.
For what it matters, I still have not seen any 2009 BFH's.