Question about little people.....?

There are 6.7 billion people on earth. Little people are a very small percentage. How many 7' 5 and over people do you see walking the streets. You see 6'5 or even 7' people but you will hardly ever see someone over 7' 5. Same thing for little people. By the way they only have to be under 4' 10 at adult height to be classified "Dwarf"