sentences:  Growth in the 1950s and 1960s enabled Renault to open several newer car plants on greenfield sites in France, Spain and, later, further afield.Rising wages, union militancy (especially in the big car plants of the Paris region) and high employment taxes encouraged the French auto-industry to become a pioneer of automated vehicle assembly and the Billancourt factory, designed for an era of labor-intensive production processes, was hard to adapt to the new techniques.Renault announced in 1989 that the factory would close and Billancourt's last car, a Renault Supercinq, emerged on 31 March 1992.