RCA secret timeline - help needed

Now that the dust has settled for another year on the sale I'm after your help. I'm trying to piece together a timeline of the 20 sales. I'm quite good on most things post 2000 but would be grateful for any help particularly before that time. I'm especially interested in things like

The cost of cards each particular year
Notable contributors for each year
Sponsors such as Bowieart and Absolut - when they started and stopped sponsoring the exhibition
Whether the show was always held in the Gulbenkian gallery?
How many cards were shown each year

Anything else of note.

If you think you can help please post a comment on the blog or tweet me @rcasecretblog. Many thanks in advance.