I'd be really interested in the percentiles of the non-native speakers. With an alarmingly low 10.700 words, there is not even a percentile for me... And I know that my fluency of English is at least above the median around here (edit: here = where I live). This also shows how extremely time-consuming it is to learn a second language. I started in school, 10 years old, am moderately well educated (some college drop-o…
Beyond this, it's pretty much necessary to live abroad for an extended period of time, or be exceptionally good (driven) at languages and watch TONS of TV, use tons of online chat, etc.