* Decentralized Education System: Switzerland has a highly decentralized education system. Each canton (state) is responsible for its own education policies and curricula. Therefore, there's no national body collecting and reporting this data uniformly.
* Different Educational Pathways: The Swiss system offers various pathways after compulsory schooling (typically ending at age 15 or 16), including vocational training (which is highly valued and considered a successful path), gymnasium (leading to university), and other options. A simple "graduation rate" doesn't capture this complexity. Someone successfully completing vocational training is equally successful, but not reflected in a traditional high school graduation metric.
* Data Collection Differences: Even within cantons, data collection methods and definitions of "graduation" may vary.
To get information, you'd need to research individual cantons' education statistics. You might find data on completion rates for specific educational pathways within a canton, but not a single nationwide "high school graduation rate" figure.