Brazil 1984-1986: Chevrolet Monza tops the charts
I could not access detailed car sales figures for Brazil over the period, only a Chevrolet Monza advertisement in Quatro Rodas celebrating 2 years of domination over the Brazilian market in 1984 and 1985.
The Monza sold 70,577 units in 1984 and 75,240 in 1985, and in all likeliness it kept the lead in 1986 before the crowning of the VW Gol in 1987.
Chevrolet Monza advertisements below.
Source: Quatro Rodas, Anfavea