..i suppose you also have to take into account that those figures are for cars that were taxed on that date. For instance i probably had three 164s at that time, but most likely only one (or maybe two) of them was taxed.. the others were in "project" mode..
also, some cars will have died since 2008, but a small number will have been imported as well. still interesting though..
I think somebody posted the total sales figures on here before as well..? from memory there were about 400 155s, 400 164s, 400 166s... and 7000 156s.