More Autovacuum Questions

Thanks to those who answered my first question. I am looking at
implementing autovacuuming on our new production 8.1.3 systems. I am
reading the documentation on the various configuration parameters. The
autovacuum_analyze_threshold and autovacuum_vacuum_threshold talk about the
number of updated and deleted tuples. Is there anyway to calculate these
numbers in a running database?

The reason I'm asking is that we are having some sporadic slowness issues
with our databases, and I'm wanting to see how the database looks during
these times. I know that vacuuming some specific tables tends to fix the
problem. So, if I can see what autovacuum might see, I could set the
parameters correctly to try and fix the issue.

Anyway, are these number available to me?

Thanks,

Chris