The given bar chart compares the proportion of houses whose occupants owned cars over a period of 30-years,starting from 1971.
Overall, it is clear that households without cars,which used to be dominant , had lost its popularity by the end of the year.However, owning a car and 2 cars became more common among residents over the given period.
To start with, the figure for lacking of cars fell slightly by 9% in 1981 from its initial 50 % and over time, the percentage of no cars reduced steadily untill about 30% during the next decade, it ended up the period with remaining unchangeable at last index.
By contrast, owners of 1 car overtook the dominance from the others in 1991, despite experiencing a gradual decline by 2% to 32 % over the first decade, followed by a drop to 43% at the end of the year,still presenting the most widespread indication.Similarly, 2 cars accounted for 18% of ownership, contributing the lowest share,but it grew significantly by 10% in 1981, then witnessed a slow decrease till over 20%, finished the span with 30 % as same as no car