The BF board is not normally replaced en masse, so its not a straightforward question to answer. There are normally two board members retiring by rotation each year. Some get re-elected, some retire, some stand for re-election but lose. It is complicated by mid-term resignations (for instance DSSabre resigned to take up a post with US Fencing). Further complications are added by the fact that the funding position changes (for both better and for worse) periodically, resulting in plans being scaled up or down in proportion.