It isn’t a typical male/female ratio, but males have a larger ‘range’ than females, so it may be that you are just outside a female’s range. If that is the case at least one of the male’s ranges may overlap with a female’s and so hoglets could materialise. In my experience, there are usually a few more males visiting than females, but some of them visit less often.
I only have one of the females visiting from last year. She will be 5 years old this year, so is a mature female. Two of the missing ones had been visiting for 3 years and 2 years respectively, up to last year, so I fear they may no longer be around. It is very worrying that the survival of this population of hogs, which has previously been fairly stable, may rely on one 5 year old female and a selection of males. In the back of my mind is always the ghastly A24 trap as well as poor feeding and excessive marking which could possibly impact on hog numbers.