Remember that we still can't detect earth-sized planets so we don't know how many there are those... and even these big gas giants can be detected
only from closest stars.
Astronomers Discover Planet in Orion
DALLAS (AP) - Astronomers have discovered a planet orbiting a star in the constellation Orion - without ever actually seeing it. They watched the star, about 140 light-years or roughly 800 trillion miles away, and deduced the presence of a planet by how much the star wiggled.