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Can't point you to any evidence. But I would think so.
But
I'm a little confused - My (limited) understanding is that the World Bank's definition of improved
sanitation includes 'pit latrine', so that the statistic should be 2.5 billion people who don't even
have access to that. And if it is also correct that only about 1/3 of the world population have access
to a flush toilet then we could approximate that it is also 1/3 of the worlds population using pit
latrines (and 1/3 using something less than that).
If so, I would think that the number of flush toilets would by far dominate. There is probably about 1 flush toilet for every 2 people in places where they exist (Think family of 5 with 1 or 2 (in most developed countries), they also schools, offices, restaurants, shopping centers and other public facilities). As for pit latrines, I have no idea, but it would be less than one per household (say 5 people)?