The data set comprises the GA and Half Fare Travelcard subscriptions that were validly in circulation at the end of the year, broken down by zip code according to the residential addresses of the holders of the season tickets. To ensure data protection, if there are fewer than 20 subscriptions per zip code, the data record does not contain the exact number, but the mean value of the number of subscriptions across the zip codes with fewer than 20 subscriptions. The specified zip codes refer to the zip codes listed in Swisstopo's official directory of localities.