In Rifferswil about 88.5% of the population (between age 25-64) have completed either non-mandatory upper secondary education or additional higher education (either university or a Fachhochschule).
The statement highlights that a significant portion of the population in Rifferswil, specifically those aged 25 to 64, have achieved a high level of education. This is reflected by the fact that over 88% of this age group hold either non-mandatory upper secondary education or additional higher education (either university or Fachhochschule).