finally I got some time for my website and added information about the paint dots Schleich used during the years 1978-2004.
So you can see when the different dots were used and maybe limit the possibilities when searching for new smurfs.
I will add more information later. Remember: Sharing is caring! 
If you see something that seems wrong let me know. And I know my english grammar is not perfect but you have to live with that.
http://thecursedcountry.com/paintdothistory.html