What is the average download usage in GB?

According to the German Bundesnetzagentur https://www.bundesnetzagentur.de/SharedDocs/Downloads/DE/Allgemeines/Bundesnetzagentur/Publikationen/Berichte/2017/JB2016.pdf;jsessionid=E86CA52C6876C189F779907FC2D5D9D0?__blob=publicationFile&v=1 page 55 the average user consumes 60 Gigabyte on a monthly base. A survey from the united states come to the conclusion that the average usage amount was 190 GB per month per household, http://www.telecompetitor.com/igr-average-monthly-broadband-usage-is-190-gigabytes-monthly-per-household/ So what need the average citizen in reality? With todays video-compression techniques likes H.264 and VP8 the needed bandwith is reduced drastically. A videoclip generates in one hour around 700 MB traffic in normal 480p resolution. So if the PC plays in background 8 hours youtube-clips per day, it will produce 168 GB traffic per month. And that is only for watching one stream in 480p. If a person has two devices and he uses modern technology which is able to playback in 1080p quality (which even cheap Android tablets and lowend Notebooks can do) the monthly traffic counter will be much higher. So, what are the Germans are doing with their internet connection that they only need 60 GB? Are they are using sophisticated compression techniques which is more advanced than H.264?