How far do Earth's crustal plates move every year?

Each tectonic plate can move at a slightly different speed but the range of speeds is between 2 - 7 cm/year.

It is interesting to note that Moon is receding away from the Earth at roughly the same rate 3.8 cm/year and that this is about the same rate that adult fingernails grow.

It is also interesting to note that since the physical "Greenwich Meridian" was marked on the ground at the Greenwich observatory, continental drift has moved it (relative to its absolute theoretical position) about 100 meters eastwards. The mark no longer matches where the meridian passes - not even our fixed points are fixed!