What % Of The World's Population Do You Think Collect Coins?

Less than 1%. Here in the US it is about 1% or a little less and considering we are still one of the most affluent countries you would expect that an even lesser percentage would collect in other countries.

I suspect that way less than 87% of the world's population have access to safe and clean drinking water.

I imagine the total percentage of the world's population that collects coins is extremely small, less than 1 percent. Too many people in the world have to use every bit of money they possess just to stay alive.

With a sizable portion of the worlds population living in underdeveloped countries or are economically depressed/oppressed, I would have to suggest a percentile of less than .05% are real coin collectors.

Another question to consider is, what exactly does it take to be a "coin collector", for statistical purposes? If someone tosses any strange or unusual coin they encounter into a jar, does that make them a collector? If so, then the percentage is likely to be somewhere around 20%, because practically everyone rich enough to regularly handle coinage does this.

If, however, you need to show some kind of organization or commitment, to be prepared to stand up and say "I am a coin collector" (even if you only do it when no-one is listening, for security reasons) then the answer is indeed less than 1 percent.

The proportion of coin collectors is much higher in the US than it is in other countries. The reason is partly economic, partly cultural. Many other countries, even prosperous ones, simply don't have a culture of coin collection at all. Look at Africa, for example. Even in the wealtheir countries such as South Africa and Egypt, coin collecting is virtually non-existent. Middle East oil wealth "should" be driving increasing collector demand for Arabic and Islamic coins, but it's not; the coin collector culture just isn't there.

Then there's mainland China, the biggest mystery of all. China has long had a tradition of coin collecting - the oldest known coin catalogues are Chinese - and if they'd been left alone, there would be far more coin collectors in China today than there are in the US. But with all the wars and revolutions there over the past century, and especially with the Communist takeover and Cultural Revolution, coin collecting was driven underground. They're finally starting to come out of the closet again, but who can tell how many coin collectors there are, under such circumstances?

Still, the high percentage in America skews the world average. Even if no-one else in the world collected coins, that 1% of the US population that are coin collectors make up 0.04% of the worldwide population. If I had to guess a worldwide total figure, I'd say somewhere around 0.1%. Or 7,000,000 people.

My guess is that perhaps 500 million people speak English as a first language.
I would also guess that somewhere between 30% and 50% of people in the World who have completed elementary education can speak English, at least as a second language.

It is my experience of travelling in India that almost everyone can speak English, as a second language. That includes 5 year olds, without any education at all. English is the only commonly spoken language that covers almost all of India. Numismatics is alive and well in India, amongst the better educated. I have a couple of very scholarly books on ancient and medieval Indian numismatics.

It is my experience that at least 50% of Europeans can speak English as a second language. Numismatics is alive and well in Europe also.

I think it is fair to assume that a greater proportion of Americans collect coins than in any other Country.

The Chinese have taken a great interest in the rare coins of every country.

An unfortunate fact.

Taking a stab at the fakes coming out of China I assume.
The way I see it, the Chinese will stop producing copies when world stops profiting off of cheap Chinese labor and factories. And, when the majority of the Chinese are well off enough to not have to rely of producing fakes, be sure that some other country with a struggling population will pick up their share of shady work.
Not defending the practice. Just think it's a fact of life.