Each day as many as 4 billion meteors hit the Earth (as meteorites) amounting to more than a hundred tons of material. But they are almost all very small, just a few milligrams each. Only the largest ones ever reach the surface to become meteorites. The largest found meteorite (Hoba, in Namibia) weighs 60 tons. Etc etc etc.
link:
http://www.seds.org/nineplanets/nine...eteorites.html