 The total Swiss population change in 2008 (from all sources, including moves across municipal borders) was an increase of 28 and the non-Swiss population increased by 9 people.This represents a population growth rate of 2.4%.The age distribution, , in Ziefen is; 122 children or 7.9% of the population are between 0 and 6 years old and 293 teenagers or 19.0% are between 7 and 19.