Question: The WEMF AG für Werbemedienforschung collects figures on what in Switzerland?

Context paragraphs:
Christoph Ehlers: Christoph Ehlers (born 31.01.1958), is a German lawyer and entrepreneur.  Ehlers is Managing Director and sole shareholder of Equicore Beteiligungs GmbH.  He is co-founder of multiple technological companies (f.e. Biochip Technologies GmbH, , itm AG, Centogene AG but also together with Professor Lüder Gerken of Stiftung Ordnungspolitik – Centrum für Europäische Politik one of the leading German economic think tanks, and of Freiburger Vermögensmanagement GmbH, a leading German portfolio management company.  He is member of various Management and Supervisory Boards, f.e. Centogene AG in Rostock.

WEMF AG für Werbemedienforschung: The WEMF AG für Werbemedienforschung collects figures on media usage in Switzerland and Liechtenstein.

Crossair: Crossair Ltd.  Co. for Regional European Air Transport (German: Crossair AG für europäischen Regionalluftverkehr ) was a regional airline headquartered on the grounds of EuroAirport Basel-Mulhouse-Freiburg in Saint-Louis, Haut-Rhin, France, near Basel, Switzerland.  It became Swiss International Air Lines after taking over most of the assets of Swissair following that airline's bankruptcy in 2002.

Direct Selling Europe: Direct Selling Europe (DSE) is a federation of trade associations founded in 2007 to represent the interests of the European direct selling industry in the European Union.  It was founded by national direct selling associations from Austria, Belgium, Germany and Switzerland, and 10 European-based direct selling companies (AMC International AG, Déesse AG, Eismann, inmediaOne, Just International AG, Lux International AG, Pierre Lang Europe, Tupperware Brands Corporation, Vorwerk & Co AG, and WIV International AG).

Economy of Switzerland: The economy of Switzerland is one of the world's most stable economies.  The service sector has also come to play a significant economic role.  The economy of Switzerland ranks first in the world in the 2015 Global Innovation Index and the 2017 Global Competitiveness Report.

Atlantic (1921 automobile): The Atlantic was made by Atlantic AG für Automobilbau, Berlin, from 1921 to 1923.  It was a single-track car with two auxiliary side wheels and a two-seat tandem body.  An air-cooled 2-cylinder 1.8/6.5PS engine was used.

Simmering-Graz-Pauker: Simmering-Graz-Pauker AG (SGP), founded as "Simmering-Graz-Pauker AG für Maschinen-, Kessel- und Waggonbau", was an important Austrian machine and engine factory, manufacturing: machinery, boilers and rail vehicles.  It was established in 1941 through the merger of Simmering machinery and rolling stock company with the Graz machine and rolling stock company and the Paukerwerkstraße Corporation from Vienna.

NZZ Mediengruppe: NZZ (Neue Zürcher Zeitung) Mediengruppe (also known as "AG für die Neue Zürcher Zeitung") is a media company which deals with the activities related to newspaper, magazine, book publishing and television broadcasting in Zurich, Switzerland.  The company has products for the German-speaking regions of the country.

Wild Heerbrugg: The Wild (Heerbrugg) company was founded in 1921 in Switzerland.  The company manufactured optical instruments, such as surveying instruments, microscopes and instruments for photogrammetry among others.  The company changed its name several times, first being known as "Heinrich Wild, Werkstätte für Feinmechanik und Optik", then "Verkaufs-Aktiengesellschaft Heinrich Wild's Geodätische Instrumente", later "Wild Heerbrugg AG", later "Wild-Leitz".  The company was linked with Leica in 1989, then it became part of Leica Holding B.V. Its subsidiary Leica Geosystems AG became part of the Swedish Hexagon AB Group of companies in 2005.

Helios AG: The Helios AG für elektrisches Licht und Telegraphenanlagenbau was a German electrical engineering company.  Founded in 1882, it existed until its liquidation in 1930.  The company was based in the town of Ehrenfeld, which was incorporated into Cologne in 1888.  The company is presently best known for the Heliosturm, a lighthouse on the former site of the factory that was constructed for test and research purposes.

Supporting paragraphs: WEMF AG für Werbemedienforschung Economy of Switzerland
Answer: media usage