This recent survey from MyVoice into tea and tea-like drinks, their second on the subject, with the first from two years ago translated here) found actually that coffee was the top drink, replacing green tea at the top of the list.
Over the first five days of April 2009 15,578 members of the MyVoice internet community successfully completed a private online questionnaire. 54% of the sample were female, 2% in their teens, 15% in their twenties, 35% in their thirties, 30% in their forties, and 18% aged fifty or older.
Recently when it comes to packaged drinks I’ve been more of a diet coke person, but I drink mostly black tea at work and green and houji (roasted green tea) at home. That’s a good point, does the “other Japanese tea” in Q1 include houji, or does it get counted with green tea? My personal feeling is that it falls under the other Japanese tea category.
In the following questions, “tea-related drinks” covers green tea, other Japanese tea, Chinese tea, black (Indian) tea, and blended tea (either tea tea or other tea-like base) plus other herbs.