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Information on base:
German-speaking population age 14 and older in private households, at main residence in the Federal Republic of Germany.

Information on random sample:
2013: 8,702 respondents, projected to a population of 70.33 million
2014: 8,156 respondents, projected to a population of 70.52 million
2015: 7,009 respondents, projected to a population of 69.24 million
2016: 7,026 respondents, projected to a population of 69.56 million
Information on target group: "German-speaking online shoppers":
2013: projected to a population of 43.95 million
2014: projected to a population of 44.16 million
2015: projected to a population of 45.33 million
2016: projected to a population of 47.01 million
This question was phrased by the source as follows: "On the internet, users have access to a variety of services and product offers which one can make use of or order and which have to be paid for. There is a selection on this list. Would you please indicate all the points of which you would say: 'This is a service or product I use or buy online. Product: fee-based offers of newspapers and magazines, for example downloading selected articles or complete editions."
(Original German question: "Im Internet gibt es ja ganz verschiedene Dienstleistungen, Waren- und Serviceangebote, die man in Anspruch nehmen oder bestellen kann und die man dann bezahlen muss. Hier auf dieser Liste sind verschiedene Angebote aufgeschrieben. Bitte nennen Sie mir alle Punkte, bei denen Sie sagen: 'So etwas mache ich über das Internet, das nutze oder kaufe ich im Internet.'
Produkt: Kostenpflichtige Angebote von Zeitungen und Zeitschriften, z.B. ausgewählte Artikel, komplette Ausgaben zum Herunterladen")