Sweden 1984-1990: Volvo 740 should be on top
The Volvo 740 launched in 1984 and should in all likeliness dominate the Swedish car sales taking the relay of the Volvo 240 which still stayed in production over the entire period. 1,009, 395 units of the Volvo 740 were produced in total from 1984 to 1992. The 760, more luxurious, was much less successful but still significant.
This is pure speculation based on Volvo production figures so if you have any official Swedish sales data please make sure to get in touch.
More info on the Volvo 740 here, more pictures below.