Gradually more brands have entered the market, which they achieved by opening production facilities. Below shows how the three main players have fared. Figures from 2005 forward are sales to the public, prior are sales to distributors.
It is not very often that Nissan can out sell big car companies like GM and VW, but in Mexico it has. Even with more brands to compete with, Nissan has increased its market share over the period above. They make reliable cars and this is obviously very important south of the border.
Last word: Nissan deserves its success in Mexico.
Sources: INEGI, AMIA.