There are 5 Olympic rings because it represents the union of the 5 continents. The colours of the ring are simple the colours of each country that has participated since 776 BC.
So every year 5 continents participate in the Olympic games. For the past ten years.
59
88 countries competed in the 2010 olympics.
204
4,955 athletes from 69 countries competed in the 1952 Summer Games in Helsinki.
one
82 nations.
i dont know 20
Japan has competed in the Olympics since 1912 so that's 100 years exactly :)
Shaun White has been is the Olympics for 3 years.
78 years (New Zealand)
10,820 athletes from 204 countries competed in the 2012 London Olympics.
5 years