I'll give you the 28 year figure but currently....
Livi population is around 56.840
Killie Population is around 47,040
Its also exactly the same distance from Killie to Ibrox as it is from Livi to Easter Road, 18 miles.
You should be attracting a lot more than you currently do considering your an established top flight team throu the likes of community engagement within primary schools or having supporters clubs within secondary schools, like we do, ie future fans.