preferred route statistics

Hello, I noticed that the preferred route counter seems to be incremented for each time the route is exported by another protocol. E.g. I've a static protocol with 25 routes which are exported by two other protocols, this results in the following statistics: 25 imported, 0 exported, 50 preferred I'm wondering if that's the intended behavior? So far I expected that preferred means number of routes which are considered "best" in the corresponding routing table (so preferred would be always <= imported). Best Regards, Freddy