Meaning of "show protocols" output

Does anyone know what "preferred" in the context of rs6-l:~> birdc show protocols all R192_y BIRD 1.3.7 ready. name proto table state since info R192_y BGP Txxxxx up 2013-01-15 11:19:19 Established Description: xxxxx Preference: 100 Input filter: (unnamed) Output filter: (unnamed) Import limit: 150000 Action: restart Routes: 14303 imported, 59164 exported, 22150 preferred means. R192_y is a BGP IPv4 neighbour. TIA, Arnold -- Arnold Nipper / nIPper consulting, Sandhausen, Germany email: arnold@nipper.de phone: +49 6224 5593407 2 mobile: +49 172 2650958 fax: +49 6224 5593407 9