[Callers] Dance Variety

As I programed my dance evenings for this weekend, I noticed that close to 80% of my dance cards have just the Ladies in the center doing something, About 10% have the Gents going in, and the remaining 10% or so have both the Lady and the Gent, or neither the Lady or the Gent going in. My observations consider a Hey and Half hey as neutral, and as such I did not include the hey in my estimations. However if the hey was set up by an allemande or chain, those basics were considered. Is this unique to my collection or this generally true of contra dances? Rich Sbardella Stafford, CT