This is the 617 Factory Bombing Run (FBR) Stats page

The way it works is, it looks at the sorties pages and counts all the missions that have a DB7 and are 30 minutes or longer. Then it counts the number of kills, deaths, and adds up the total time for the missions that fall into that category.

Legend

Missions: The number of FBRs flown
Kills: The number of kills during FBRs
Losses: The number of KIAs, MIAs and Crits during FBRs
Hours: The number of hours flown during FBRs
Mission/Death: The ratio of missions to deaths