The anti-dumping duties in force in the current administrative reviews are a weighted average of the two largest softwood lumber producers' anti-dumping duty rates: Canfor and West Fraser. A weight average of their company-specific rates is taken, and that is applied as what's called an “all others” rate. The dumping duties that are paid currently would be an average of those two companies' dumping rates.
What you're getting at, though—to answer the question a bit more directly—is true. Generally, when market conditions are a bit poorer, dumping duties can go up, but they're ultimately determined by the commercial decisions and pricing of those two companies I mentioned just a few minutes ago.