 The total Swiss population change in 2008 (from all sources, including moves across municipal borders) was a decrease of 5 and the non-Swiss population decreased by 6 people.This represents a population growth rate of -1.8%.The age distribution, , in Bennwil is; 67 children or 10.6% of the population are between 0 and 6 years old and 86 teenagers or 13.6% are between 7 and 19.